Question

81:30::64: why next number

Answer 1

let the fourth be x then
81:30::64:x
we know that product of extreme=product of mean
so
$x \times 81 = 64 \times 30 \\ so \: x = \frac{64 \times 30}{81}$
$x = 23.7$


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Answer 2

solution - a:b::c:d

Let the next number be d.

=81:30::64:d
=81/30=64/d

The four numbers are in proportion.
product of extremes=product of means

i.e., 81×d=30×64
=81×d=1920
=d=1920÷81
=23.7 ans