Question

Find the value of the unknown in the following proportions:
a) 2 : y :: 1: 3
b) 7 : 15 :: z : 2
Please give answer with full formula

Answer 1

(a)2:y::1:3

2 × 3 = 1 × y ( product of extreme terms = product of mean terms )

6 = 1× y

y = 6 ÷ 1

y = 6

(b)7:15::z:2

7 × 2 = 15 × z ( same formula as the 1st one )

14 = 15 × z

z = 1.071

here, is your answer