Question

The first three terms of a proportion are 4,7 and 28 respectively find its fourth term.

Answer 1

Step-by-step explanation:

Given, the first three terms of a proportion are 4,7 and 28 respectively.

Let the fourth number be ′x′,

So, Numbers proportion are 4,7,28,x

According to proportionality,

Product of means = Product of extremes

4:7::28:x

7÷4 = x÷28

Cross multiply,

4×x=28×7

4x=196

x=196÷4

x=49

Therefore, The required fourth number is 49.