MathematicsIf the first three terms of a proportion are 3, 5 and 21 respectively, then its fourth term is

If the first three terms of a proportion are 3, 5 and 21 respectively, then its fourth term is


  1. A
    21
  2. B
    35
  3. C
    15
  4. D
    None 

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    Solution:

    Given, the first three terms of a proportion are 3, 5 and 21 respectively.
    Let the fourth term be x.
    Terms of proportions are 3, 5, 21, x.
    We know that product of extremes = product of means. So,
    21:x=3:5   21 x = 3 5  
    Apply the cross-multiplication method.
    3x=21×5   3x=105   x= 105 3  
    x=35  
    If the first three terms of a proportion are 3, 5 and 21 respectively, then its fourth term is 35.
    Hence option 2 is the answer.
     
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