Question

68 : 18 : : 72 : ?
find the value of ?

Answer 1

let ?= x
extreme term= 68,x
middle term= 18,72
multyply of extreme term = multiply of middle term
68*x= 18*72
x = 18*72/68
= 1296/68
=19.05

Answer 2

let ? be x
product of means = product of extremes
means = 18 ,72
extremes.= 68, x
given,
18*72=68 *x
x *68=18*72
x = 18*72/68