Question

82 :64::92:? solve it

Answer 1

In the given question,

82:64::92:_

Comparing this with the general form, a:b::c:d, we get,

                     a= 82,

                     b=64,

                     c=92,

                     d=x (say)

We know that,

                        Product of means = Product of extremes

                                             (b*c) = (a*d)

                                           64*92 = 82*x

                                    So,         x = (92*64)/82

                                                     = 71.8

Therefore, the required answer is 71.8.

Hope this helps!

Answer 2

 Given proportion is ⇒
    82 :64::92:?

Let the fourth proportion be x. 

∴ New proportion will be, 
  82 :64::92:x

∴ Products of the means = 64 × 92 = 588
Also ,Products of the Extremes = 82x

∵ Products of the means = Products f the Extremes
∴ 588 = 82x
⇒ $\boxed{ x = 70.80 }$  


Hence, the forth proportion is 70.80


Hope it helps.