Question
Show that 36, 49, 6, 7 are not in proportion.

Answer

We know that if a, b, c, d are in proportion if ad = bc
Now 36, 49, 6, 7 are in proportion
if 36 × 7 = 49 × 6
if 252 = 294
But 252 ≠ 294
36, 49, 6, 7 are not in proportion.

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