Question

Find the third proportional to :
(i) 36 and 18​

Answer 1

Answer: 18^2 =36x or, x = 18×18/36 or, x =9. The third proportion is 9. Hope it helps. kaypeeoh72z and 39 more users found this answer helpful.

Step-by-step explanation:

method 1 ;- let the third proportion be x

36 , 18 ,x are in proportion.

therefore  , 38x = 18^2

36x = 18 x 18

(2 x 18 )x = 18 x 18

x = 9

method 2 :- Let's think the third proportion is x

We know,

a/b = b/c

or, b^2 = ac

Now,

18^2 =36x

or, x = 18×18/36  

or, x =9

The third proportion is 9  

Hope it helps.