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Railways Sample Paper RRB (Group D) Sample Test Paper-15

  • question_answer
    The fourth proportional to 5, 8,15 is:

    A)  18       

    B)  24

    C)  19                   

    D)  20

    Correct Answer: B

    Solution :

    [b] Let the fourth proportional to 5, 8, 15 be x. Then, \[5:8::15:x\Rightarrow \,\,5x=(8\times 15)\Rightarrow \,\,x=\frac{(8\times 15)}{5}=24.\]


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