Question

First , second , and fourth terms of a proportion are 12, 21 and 28 respectively . the third term of the proportion is

Answer 1

ANSWER

let the third term be x

12:21:x:28

product of means = product of extremes

12x28=21Xx

336=21x

x=336/21

x=16

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Answer 2

hey mate,

here is your answer,

solution:

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Let us assume the third term as  'x' .

Then the proportion will be as followed.....

12 : 21 : x : 28

product of means =  product of extremes

12 * 28 = 21 * x

336 = 21 x

transpose 21 to L.H.S.

In R.H.S. 21 was in multiplication form,

when it moves to L.H.S it become division form.

336 / 21 =  x

when we cancel we get

16/1 =x

⇒x = 16.

∴the third term of the proportion is 16.

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hope this helps you.

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