See the number 71280 Your quote ' 71.28 x 4 = 356.4 units.'
In the Great pyramid the volume of the coffer in the Kings chamber = 71280 cubic inches..
Petrie's measures for the inside volume of the coffer. p.30 'the pyramids and temples of giza' . inside length 78.06 inside width 26.81 ins inner depth 34.42.
71280 / length 78.06 = 913.1437356 / width 26.81 = 34.058 inches now that is not exact as it is 0.382 of an inch out.
however the inside depth was difficult to measure as many pieces chipped off and a ledge probably holding a lid also there.
This stuff pops up all the time and is doing the same with circles etc in the UK and Europe.