if the first three terms of a proportion are 3,21and 35,then its fourth term will be
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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.
Hope this is helpful for you.
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