Question

The ratio between the third proportional to 12 and 30 and mean proportion of 9 and 25, is ______.

Options

• 2 : 1

• 5 : 1

• 7 : 15

• 9 : 14

Answer 1

The ratio between the third proportional to 12 and 30 and mean proportion of 9 and 25, is 5 : 1.

Explanation:

The third proportional to 12 and 30 is `30^2/12 = 75`. The mean proportion between 9 and 25 is 15; hence the ratio is 75 : 15 = 5 : 1.