Question

Find the value of x in each of the following:
a. X: 12 :: 7 : 2
​

Answer 1

Answer:

X: 12::7:2

12 X 7 = 2 X x

84 = 2x

42 = x

hence, x = 42

Answer 2

$\rm{x : 12 :: 7 : 2 \longrightarrow x\times 2 = 12\times 7\quad...\:Since\:Product\:of\:Means = Product\:of\:Extremes}$

$\longrightarrow\rm{ x\times 2 = 12\times 7 \longrightarrow 2x = 84 \longrightarrow x = 84/2 = 42}$