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NTSE Sample Paper NTSE SAT Practice Test-6

  • question_answer
    The ratio of third proportional to 12 and 30 and the mean proportional to 9 and 25 is

    A) 2 : 1                 

    B) 5 : 1

    C) 7 : 15               

    D) 9 :14

    Correct Answer: B

    Solution :

    [b] Third proportional of a and b is \[\frac{{{b}^{2}}}{a}\]whereas proportional of a and b is  \[\sqrt{ab}\] \[\Rightarrow \frac{30\times 30}{12}:\sqrt{9\times 25}=5:1\]


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