If 42, 36, and 35 are the first three terms of a proportion, then the fourth term is:
Show answer & explanation
Correct answer: C
Explanation
The correct answer is Option 3 i.e. 30.
Concept:
If four terms are in proportion then, we can write them as follows
a : b :: c : d
a/b = c/d
Calculations:
Let the fourth term be x
Here, a = 42, b = 36, c = 35, and d = x
⇒ 42/36 = 35/x
⇒ x = (35 × 36)/42
⇒ x = 30
So, the fourth term is 30