Question

if the first three term of a proportion of 3,21 and 35 then its fourth term will be​

Answer 1

Answer:

The required fourth number is 35

Step-by-step explanation:

Given, the first three terms of a proportion are 3,5 and 21 respectively.

Let the fourth number be 'x'

So, number proportion are 3,5,21,x

According to proportionality, Product of Means = Product of Extremes

3 : 5 :: 21 : x

3/5 = 21/x

Cross Multiply

3 * x = 21 * 5

3x = 105

x = 105/3, x = 35

Therefore, The required fourth number is 35.