Find the mean proportion of 40 and 90
16
60
50
6
Let the mean proportion be b
Hence we have 40 : b :: b : 90
∴ 40b = b90
b2=40×90=3600
b = 60
Hence the mean proportion is 60
Find the mean proportion of 3 and 243
Solve the following.
Find the mean proportion between 9 and 49.