Question

Mean proportion between 9 and 25 is:
(a) 5
(b) 8
(c) 17
(d) 15​

Answer 1

Answer:

Let x be the mean proportional between 9 and 25.

⇒ x 2 = 9 x 25

⇒ x 2 = 225

⇒ x = 15

Hence, the mean proportional between 9 and 25 is 15.