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1 mark

The fourth proportional to 12,15,24 is:

  1. A
    20
  2. B
    30
  3. C
    25
  4. D
    32

Solution & Step-by-step Explanation

Let the fourth proportional to 12,15,24 be x.
By the definition of proportion:

15
12
​
=
x
24
​

Solving for x:

12×x=15×24
x=
12
15×24
​

x=15×2=30

Practice this question

Try it yourself before checking the explanation above.

The fourth proportional to 12,15,24 is:
A
20
B
30
C
25
D
32

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Ratio and ProportionFourth Proportional

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