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Question
Determine if the following numbers are in proportion:
22, 33, 42, 63
Solution
22, 33, 42, 63 or 22 : 33 :: 42 : 63 are in proportion, if ad = bc.
If 22 × 63 = 33 × 42
If 1386 = 1386
∴ 22, 33, 42, 63 are in proportion.
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