Find the mean proportional between 9 and 16

Find the mean proportional between 9 and 25.

Find the mean proportional between 48 and 12.

Find the mean proportion between 81 and 121

Find the mean proportion between : 18 and 8

Find the mean proportion between 1 . 8 and 0.2

Find the mean proportion between 0.32 and 0.08

Find the mean proportional between : (i) 6 + 3sqrt(3) and 8 - 4sqrt(3) (ii) a - b and a^(3) - a^(2)b.