Question

if the first three terms of a proportion are 3,21and 35,then its fourth term will be​

Answer 1

Answer:

Given, the first three terms of a proportion are 3,5 and 21 respectively.

Let the fourth number be ′x′ ,

So, Numbers proportion are 3,5,21,x

According to proportionality,

Product of means = Product of extremes

3:5::21:x

3/5 = 21/x

Cross multiply,

3×x=21×5

3x=105

x=35

Therefore, The required fourth number is 35.

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