It is possible to produce a 24x24 magic square which consists of 4x4 proportional 4x4 in 6x6 magic squares.
Take 1x number from the first grid and add 36x number of the same cell from the second grid.
1x number
1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 |
35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 |
33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 |
27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 |
7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 |
8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 |
1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 |
35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 |
33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 |
27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 |
7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 |
8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 |
1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 |
35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 |
33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 |
27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 |
7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 |
8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 |
1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 | 1 | 6 | 9 | 34 | 32 | 29 |
35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 | 35 | 11 | 18 | 23 | 22 | 2 |
33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 | 33 | 25 | 20 | 13 | 16 | 4 |
27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 | 27 | 14 | 15 | 26 | 19 | 10 |
7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 | 7 | 24 | 21 | 12 | 17 | 30 |
8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 | 8 | 31 | 28 | 3 | 5 | 36 |
+ 36 x number
0 | 15 | 0 | 15 | 0 | 15 | 1 | 14 | 1 | 14 | 1 | 14 | 2 | 13 | 2 | 13 | 2 | 13 | 3 | 12 | 3 | 12 | 3 | 12 |
15 | 0 | 15 | 0 | 15 | 0 | 14 | 1 | 14 | 1 | 14 | 1 | 13 | 2 | 13 | 2 | 13 | 2 | 12 | 3 | 12 | 3 | 12 | 3 |
0 | 15 | 0 | 15 | 0 | 15 | 1 | 14 | 1 | 14 | 1 | 14 | 2 | 13 | 2 | 13 | 2 | 13 | 3 | 12 | 3 | 12 | 3 | 12 |
15 | 15 | 0 | 15 | 0 | 0 | 14 | 14 | 1 | 14 | 1 | 1 | 13 | 13 | 2 | 13 | 2 | 2 | 12 | 12 | 3 | 12 | 3 | 3 |
15 | 0 | 15 | 0 | 15 | 0 | 14 | 1 | 14 | 1 | 14 | 1 | 13 | 2 | 13 | 2 | 13 | 2 | 12 | 3 | 12 | 3 | 12 | 3 |
0 | 0 | 15 | 0 | 15 | 15 | 1 | 1 | 14 | 1 | 14 | 14 | 2 | 2 | 13 | 2 | 13 | 13 | 3 | 3 | 12 | 3 | 12 | 12 |
4 | 11 | 4 | 11 | 4 | 11 | 5 | 10 | 5 | 10 | 5 | 10 | 6 | 9 | 6 | 9 | 6 | 9 | 7 | 8 | 7 | 8 | 7 | 8 |
11 | 4 | 11 | 4 | 11 | 4 | 10 | 5 | 10 | 5 | 10 | 5 | 9 | 6 | 9 | 6 | 9 | 6 | 8 | 7 | 8 | 7 | 8 | 7 |
4 | 11 | 4 | 11 | 4 | 11 | 5 | 10 | 5 | 10 | 5 | 10 | 6 | 9 | 6 | 9 | 6 | 9 | 7 | 8 | 7 | 8 | 7 | 8 |
11 | 11 | 4 | 11 | 4 | 4 | 10 | 10 | 5 | 10 | 5 | 5 | 9 | 9 | 6 | 9 | 6 | 6 | 8 | 8 | 7 | 8 | 7 | 7 |
11 | 4 | 11 | 4 | 11 | 4 | 10 | 5 | 10 | 5 | 10 | 5 | 9 | 6 | 9 | 6 | 9 | 6 | 8 | 7 | 8 | 7 | 8 | 7 |
4 | 4 | 11 | 4 | 11 | 11 | 5 | 5 | 10 | 5 | 10 | 10 | 6 | 6 | 9 | 6 | 9 | 9 | 7 | 7 | 8 | 7 | 8 | 8 |
8 | 7 | 8 | 7 | 8 | 7 | 9 | 6 | 9 | 6 | 9 | 6 | 10 | 5 | 10 | 5 | 10 | 5 | 11 | 4 | 11 | 4 | 11 | 4 |
7 | 8 | 7 | 8 | 7 | 8 | 6 | 9 | 6 | 9 | 6 | 9 | 5 | 10 | 5 | 10 | 5 | 10 | 4 | 11 | 4 | 11 | 4 | 11 |
8 | 7 | 8 | 7 | 8 | 7 | 9 | 6 | 9 | 6 | 9 | 6 | 10 | 5 | 10 | 5 | 10 | 5 | 11 | 4 | 11 | 4 | 11 | 4 |
7 | 7 | 8 | 7 | 8 | 8 | 6 | 6 | 9 | 6 | 9 | 9 | 5 | 5 | 10 | 5 | 10 | 10 | 4 | 4 | 11 | 4 | 11 | 11 |
7 | 8 | 7 | 8 | 7 | 8 | 6 | 9 | 6 | 9 | 6 | 9 | 5 | 10 | 5 | 10 | 5 | 10 | 4 | 11 | 4 | 11 | 4 | 11 |
8 | 8 | 7 | 8 | 7 | 7 | 9 | 9 | 6 | 9 | 6 | 6 | 10 | 10 | 5 | 10 | 5 | 5 | 11 | 11 | 4 | 11 | 4 | 4 |
12 | 3 | 12 | 3 | 12 | 3 | 13 | 2 | 13 | 2 | 13 | 2 | 14 | 1 | 14 | 1 | 14 | 1 | 15 | 0 | 15 | 0 | 15 | 0 |
3 | 12 | 3 | 12 | 3 | 12 | 2 | 13 | 2 | 13 | 2 | 13 | 1 | 14 | 1 | 14 | 1 | 14 | 0 | 15 | 0 | 15 | 0 | 15 |
12 | 3 | 12 | 3 | 12 | 3 | 13 | 2 | 13 | 2 | 13 | 2 | 14 | 1 | 14 | 1 | 14 | 1 | 15 | 0 | 15 | 0 | 15 | 0 |
3 | 3 | 12 | 3 | 12 | 12 | 2 | 2 | 13 | 2 | 13 | 13 | 1 | 1 | 14 | 1 | 14 | 14 | 0 | 0 | 15 | 0 | 15 | 15 |
3 | 12 | 3 | 12 | 3 | 12 | 2 | 13 | 2 | 13 | 2 | 13 | 1 | 14 | 1 | 14 | 1 | 14 | 0 | 15 | 0 | 15 | 0 | 15 |
12 | 12 | 3 | 12 | 3 | 3 | 13 | 13 | 2 | 13 | 2 | 2 | 14 | 14 | 1 | 14 | 1 | 1 | 15 | 15 | 0 | 15 | 0 | 0 |
= 24x24 magic square
1 | 546 | 9 | 574 | 32 | 569 | 37 | 510 | 45 | 538 | 68 | 533 | 73 | 474 | 81 | 502 | 104 | 497 | 109 | 438 | 117 | 466 | 140 | 461 |
575 | 11 | 558 | 23 | 562 | 2 | 539 | 47 | 522 | 59 | 526 | 38 | 503 | 83 | 486 | 95 | 490 | 74 | 467 | 119 | 450 | 131 | 454 | 110 |
33 | 565 | 20 | 553 | 16 | 544 | 69 | 529 | 56 | 517 | 52 | 508 | 105 | 493 | 92 | 481 | 88 | 472 | 141 | 457 | 128 | 445 | 124 | 436 |
567 | 554 | 15 | 566 | 19 | 10 | 531 | 518 | 51 | 530 | 55 | 46 | 495 | 482 | 87 | 494 | 91 | 82 | 459 | 446 | 123 | 458 | 127 | 118 |
547 | 24 | 561 | 12 | 557 | 30 | 511 | 60 | 525 | 48 | 521 | 66 | 475 | 96 | 489 | 84 | 485 | 102 | 439 | 132 | 453 | 120 | 449 | 138 |
8 | 31 | 568 | 3 | 545 | 576 | 44 | 67 | 532 | 39 | 509 | 540 | 80 | 103 | 496 | 75 | 473 | 504 | 116 | 139 | 460 | 111 | 437 | 468 |
145 | 402 | 153 | 430 | 176 | 425 | 181 | 366 | 189 | 394 | 212 | 389 | 217 | 330 | 225 | 358 | 248 | 353 | 253 | 294 | 261 | 322 | 284 | 317 |
431 | 155 | 414 | 167 | 418 | 146 | 395 | 191 | 378 | 203 | 382 | 182 | 359 | 227 | 342 | 239 | 346 | 218 | 323 | 263 | 306 | 275 | 310 | 254 |
177 | 421 | 164 | 409 | 160 | 400 | 213 | 385 | 200 | 373 | 196 | 364 | 249 | 349 | 236 | 337 | 232 | 328 | 285 | 313 | 272 | 301 | 268 | 292 |
423 | 410 | 159 | 422 | 163 | 154 | 387 | 374 | 195 | 386 | 199 | 190 | 351 | 338 | 231 | 350 | 235 | 226 | 315 | 302 | 267 | 314 | 271 | 262 |
403 | 168 | 417 | 156 | 413 | 174 | 367 | 204 | 381 | 192 | 377 | 210 | 331 | 240 | 345 | 228 | 341 | 246 | 295 | 276 | 309 | 264 | 305 | 282 |
152 | 175 | 424 | 147 | 401 | 432 | 188 | 211 | 388 | 183 | 365 | 396 | 224 | 247 | 352 | 219 | 329 | 360 | 260 | 283 | 316 | 255 | 293 | 324 |
289 | 258 | 297 | 286 | 320 | 281 | 325 | 222 | 333 | 250 | 356 | 245 | 361 | 186 | 369 | 214 | 392 | 209 | 397 | 150 | 405 | 178 | 428 | 173 |
287 | 299 | 270 | 311 | 274 | 290 | 251 | 335 | 234 | 347 | 238 | 326 | 215 | 371 | 198 | 383 | 202 | 362 | 179 | 407 | 162 | 419 | 166 | 398 |
321 | 277 | 308 | 265 | 304 | 256 | 357 | 241 | 344 | 229 | 340 | 220 | 393 | 205 | 380 | 193 | 376 | 184 | 429 | 169 | 416 | 157 | 412 | 148 |
279 | 266 | 303 | 278 | 307 | 298 | 243 | 230 | 339 | 242 | 343 | 334 | 207 | 194 | 375 | 206 | 379 | 370 | 171 | 158 | 411 | 170 | 415 | 406 |
259 | 312 | 273 | 300 | 269 | 318 | 223 | 348 | 237 | 336 | 233 | 354 | 187 | 384 | 201 | 372 | 197 | 390 | 151 | 420 | 165 | 408 | 161 | 426 |
296 | 319 | 280 | 291 | 257 | 288 | 332 | 355 | 244 | 327 | 221 | 252 | 368 | 391 | 208 | 363 | 185 | 216 | 404 | 427 | 172 | 399 | 149 | 180 |
433 | 114 | 441 | 142 | 464 | 137 | 469 | 78 | 477 | 106 | 500 | 101 | 505 | 42 | 513 | 70 | 536 | 65 | 541 | 6 | 549 | 34 | 572 | 29 |
143 | 443 | 126 | 455 | 130 | 434 | 107 | 479 | 90 | 491 | 94 | 470 | 71 | 515 | 54 | 527 | 58 | 506 | 35 | 551 | 18 | 563 | 22 | 542 |
465 | 133 | 452 | 121 | 448 | 112 | 501 | 97 | 488 | 85 | 484 | 76 | 537 | 61 | 524 | 49 | 520 | 40 | 573 | 25 | 560 | 13 | 556 | 4 |
135 | 122 | 447 | 134 | 451 | 442 | 99 | 86 | 483 | 98 | 487 | 478 | 63 | 50 | 519 | 62 | 523 | 514 | 27 | 14 | 555 | 26 | 559 | 550 |
115 | 456 | 129 | 444 | 125 | 462 | 79 | 492 | 93 | 480 | 89 | 498 | 43 | 528 | 57 | 516 | 53 | 534 | 7 | 564 | 21 | 552 | 17 | 570 |
440 | 463 | 136 | 435 | 113 | 144 | 476 | 499 | 100 | 471 | 77 | 108 | 512 | 535 | 64 | 507 | 41 | 72 | 548 | 571 | 28 | 543 | 5 | 36 |
N.B.: Each 1/4 row/column/diagonal gives 1/4 of the magic sum and each row/column/ diagonal in each (white) 4x4 sub-square gives 1/6 of the magic sum and the 24x24 magic square is 6x6 compact.
I have used method composite, proportional (2) to construct
12x12, 18x18, 24x24, 30x30a and 30x30b