What is the ratio of third proportional to 0.4 and 0.8, to the mean proportional between 13.5 and 0.24 ?
Show answer & explanation
Correct answer: C
Explanation
The correct answer is option 3 ie 8 : 9.
(0.4/0.8) = (0.8/x)
x = 1.6
Mean proportion = 
= 1.8
(x/1.8) = (1.6/1.8) = 8/9