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1 mark

The fourth proportional to 10.8, 3.6 and 20.4 is:

  1. A
    14.8
  2. B
    6.8
  3. C
    12.4
  4. D
    9.6

Solution & Step-by-step Explanation

Let the fourth proportional be d. By definition of a proportion:
3.6
10.8
​
=
d
20.4
​

Simplifying the fraction on the left side:

3.6
10.8
​
=3
Now, solve for d:

3=
d
20.4
​
⟹d=
3
20.4
​
=6.8

Practice this question

Try it yourself before checking the explanation above.

The fourth proportional to 10.8, 3.6 and 20.4 is:
A
14.8
B
6.8
C
12.4
D
9.6

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