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6th Class Mathematics Ratio and Proportion Question Bank Ratio and Proportion

  • question_answer
    If 9, \[x\],\[x\], 49 are in proportion, find the value of \[x\]

    A)  7                                            

    B)  14

    C)  21                           

    D) 35

    Correct Answer: C

    Solution :

     Given 9,x,x, 49 are in proportion. \[\Rightarrow 9\times 49=x\times x\] \[\Rightarrow 3\times 3\times 7\times 7=x\times x\] \[\Rightarrow (3\times 7)\times (3\times 7)=x\times x\] \[\Rightarrow x=3\times 7=21\]


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