Proposition:
If A,B are similar solid numbers,
A=CDE, B = FGH and
C:D=F:G and D:E=G:H, then
A:B is the triplicate ratio of C:F, D:G, E:H, and
there are two mean numbers between A and B
PDFs:
https://github.com/sandy-bultena/Euclid/tree/master/Propositions/PDFs
