Question

3,7,9, x are in proportion then the value of x = .........
A) 21
B) 63
C) 27
D) 23​

Answer 1

Answer:

a}21

Step-by-step explanation:

x = 7*9 ÷ 3

= 63÷3

=21

Answer 2

The value of x = 21

Given :

3 , 7 , 9 , x are in proportion

To find :

The value of x is

A) 21

B) 63

C) 27

D) 23

Solution :

Step 1 of 2 :

Form the equation

Here it is given that 3 , 7 , 9 , x are in proportion

By the given condition

3 : 7 = 9 : x

Step 2 of 2 :

Find the value of x

$\displaystyle \sf{ 3 : 7 = 9 : x}$

$\displaystyle \sf{ \implies \frac{3}{7} = \frac{9}{x} }$

$\displaystyle \sf{ \implies 3x = 7 \times 9 }$

$\displaystyle \sf{ \implies 3x = 63 }$

$\displaystyle \sf{ \implies x = \frac{63}{3} }$

$\displaystyle \sf{ \implies x =21 }$

Hence the correct option is A) 21

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