Question

the first second
and fourth of a proportion are 7 .5 ,1.5 and 1.2 respectively .find the third term

Answer 1

Let third number be X
7.5:1.5::X:1.2
(7.5×1.2)/1.5=6

Answer 2

let the third proportional be X
7.5, 1.5, X,1.2
product of extremes = product of means
7.5 * 1.2 = 1.5X
9= 1.5X
9÷1.5=X
X=6
Therefore, the third term is 6
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