alleryFor what value of x are 4, 6 and x in proportion, meaning 4:6 = 6:x?
A8
B9
C10
D12
Answer & Solution
Correct answer: B. 9
1. Three terms p, q, r are in proportion when p:q = q:r.
2. Here 4:6 = 6:x, so 4/6 = 6/x.
3. Cross-multiplying gives 4x = 36, so x = 9.
_Source: Wikipedia, Ratio, Euclid's definitions_
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