For the Indus Valley Civilization, the basis of the ratios is the series of weights, that appear to be possibly base 8 or 16. I don't know what the basis of the weight system in Mesopotamia, but it is believed that the elemental weight for the Indus system is the ratti seed from the gunja Indian creeper. The average ratti is about 0.19 grams and it would take about 8 of these to equal the smallest known weight in the Indus (0.871 grams); thus, it seems for the first seven sets of weights, the ratio follows this as 1:2:4:8:16:32:64; after this, it appears to change from a binary system (with larger weights - assuming that weights can be combined, of course) to what some think of as a decimal system - 160:200:320:640 - then a jump to 1600:3200:6400:8000:12,800. This is by no means a complete discussion, but you get the general idea (which you may have known already!).

thank you very much for your answer. that was my problem, the basis of archaeological material for determining these values and ratios. now the divisions of each weights values by ratios is the lowest weight value.

Sure, there is a difference between them and you can communicate with a number of specialized professors to discuss this issue. Certainly, such studies depend mainly on archaeological discoveries that have been found.

Perhaps the reason is due to the difference in the type of material weights and intensity as well as quality differences I read one article if one studies whether stone or metal vary the quality and intensity, characteristics from one country to another and from one place to another depending on the climatic and environmental conditions ...