Problems on Ratios and Proportions : Quantitative Aptitude

  • Find the fourth proportional to 2.4, 4.6 and 7.6?

    A.) 14 B.) 14.657
    C.) 15.56 D.) 14.56
    Answer: Option 'D'

    Formula = Fourth propotional = (b × c)/a

    A = 2.4 , B = 4.6 and C = 7.6

    (4.6 × 7.6)/2.4 = 14.56


  • Find the third proportional to 9 and 12?

    A.) 9 B.) 108
    C.) 16 D.) 9
    Answer: Option 'C'

    Formula = Third proportional = (b × b)/a

    A = 9 and B = 12

    (12 × 12)/ 9 = 144/9 = 16


  • Find the mean proportional between 49 & 81?

    A.) 16 B.) 10
    C.) 63 D.) 12
    Answer: Option 'C'

    Formula = √a×b

    A = 49 and B = 81

    √49×81 = 7 × 9 = 63


  • Find the fourth proportional to 0.2,0.12 and 0.3?

    A.) 0.13 B.) 0.18
    C.) 0.8 D.) 0.15
    Answer: Option 'C'

    Formula = Fourth propotional = (b × c)/a

    A = 0.2 , B = 0.12 and C = 0.3

    (0.12 × 0.3)/0.2

    0.036/0.2 = 0.18


  • If a:b=1:2 and b:c=3:4 find a:b:c?

    A.) 3:8:6 B.) 3:12:6
    C.) 3:6:8 D.) 1:2:4
    Answer: Option 'C'

    a:b = 1:2, b:c = 3:4

    1:2

    3:4

    (a = 1 × 3 = 3, b = 2 × 3 = 6 and c = 2 × 4 = 8)

    (a = a × b, b = b × b and c = b × c)

    a:b:c = 3:6:8



Quantitative Aptitude Topics


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