Question

If 12, 14, 9 and x are in proportion then find the value of x.

A.
21


B.
9


C.
10.5


D.
105

Answer 1

Answer is 10.5
Soln: 12,14,9,x are in proportion
12/14=9/x
=x+9*14/12
=x=21/2
=x=10.5

Answer 2

HELLO DEAR,





WE KNOW THAT,


WHERE,

P=12
Q=14
R=9
S=X


p : q : : r : s

=> ps = qr


$12 \times x = 14 \times 9 \\ = > x = \frac{14 \times 3 \times 3}{ 3\times 2 \times 2} \\ = > x = \frac{21}{2} \\ = > x = 10.5$


I HOPE ITS HELP YOU DEAR,
THANKS