Question

In a proportion, the 1st, 2nd and 4th term are 51, 68 and 108 respectively. Find the 3rd term.​

Answer 1

Answer:

let us suppose that 3rd term be x

according to question

51:68::x:108

51/68=x/108

68x=108×51(cross multiplication)

x=(108×51)/68

x=81 ans

81 is the 3rd term

Answer 2

Given,

1st term = 51

2nd term = 68

4th term = 108

to find,

3rd term

Solution,

Let the 3rd term be x

therefore, 51 : 68 :: x : 108

therefore, in a proportion

Product of extremes = Product of means

51 x 108 = x * 68

x = 51 x 108/ 68

therefore, x = 81

hence, 3rd term x is 81