Question

What is the unknown denominator if 9/12 = 3/

Answer 1

Do cross multiplication.

9 3
__ = __
12 x

12×3=36. So now you found that out you will do a equation. Solve it.

9x=36
÷9 ÷9
________
x= 4

Now you got what the unknown denominator is. It's x=4. So 4.

Answer 2

Solve as a proportion:


`(9)/(12)= (3)/(x)`

x = ?

Cross multiply:-

3 × 12 = 36

Divide:-

36 ÷ 9 = x
36 ÷ 9 = 4
x = 4

9/12 = 3/4

The unknown denominator is 4.