1) Show that 30, 40, 45, 60 are in proportion.
2) Show that 36, 49, 6, 7 are not in proportion.
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Solution :-
1) 30, 40, 45, 60
==> 30 x 60=40 x 45 [Product of Extreme
= Product of Means]
==> 1800 = 1800
∴ Hence, the products of the proportional are same. Therefore, they are in proportion.
∴ Hence, 1800 = 1800
2) 36, 49, 6, 7
==> 36 x 7=49 x 6 [Product of Extreme
= Product of Means]
==> 252 ≠ 294
∴ Hence, the products of the proportional are not same. Therefore, they are not in proportion.
∴ Hence, 252 ≠ 294
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