Question

what is the third proportional to 9 and 25

Answer 1

Answer:

15

Step-by-step explanation:

Step-by-step explanation:

Let the third proportional to 12 and 30 be x.

Then, 12 : 30 :: 30 : x

⇔ 12x = 30 × 30

⇔x=

12

(30×30)

​

=75

∴ Third proportional to 12 and 30 = 75.

Mean proportional between 9 and 25=

9×25

​

=15

∴ Required ratio = 75 : 15 = 5 : 1.

Answer 2

Given:

Two numbers are 9 and 25.

To find:

To calculate the third proportional to the two numbers.

Solution:

We know that,

A: B:: B: C

C is the third proportional to A and B.

The value of C is given by the formula,

C = (B)²/A

Here, A= 9

B = 25

C = (25)²/9

C = 625/9

= 69.44

The third proportional to A and B is 69.44.