MCQ
Mark $(\checkmark)$ against the correct answer in the following: If $a, b, c$ are in proportion, then:
- A$a^2 = bc$
- ✓$b^2 = ac$
- C$c^2 = ab$
- DNone of these.
✓
Answer
Correct option: B.
$b^2 = ac$
$a, b, c$ are in proportion, such that we have:
$a : b :: b : c$
Now, we know:
Product of means $=$ Product of extremes
$b \times b = a \times c$
$b^2 = ac$
$a : b :: b : c$
Now, we know:
Product of means $=$ Product of extremes
$b \times b = a \times c$
$b^2 = ac$
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