Question

find the fourth proportion of the following -
(i) 9 ,36, 19

(ii) 1/3 , 1/5 , 1/7

(iii) 5.1 : 8.5 :1.8


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Answer 1

product of mean terms=product of extremes term

let the value be = x

$36 \times 19 = 9x \\ x = 19 \times 4 \\ x = 76$

Answer 2

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