Question

find the fourth proportion of 20,25 and 4
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Answer 1

Answer: 20:25:4:y ( Let the fourth proportion be y)

Product of means= Product of extremes

25 x 4= 20 x y

100= 20y

y= 100/20

y= 5

So, the fourth proportion is 5.

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Answer 2

Step-by-step explanation:

let the fourth number be x

20/25 =4/x

cross multiply

20x/25 =4

4*25/20=x

5