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Find the missing number in problems: 15 : 19 = 45 : _______

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Find the missing number in problems: 15 : 19 = 45 : _______

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Given 15 : 19 = 45 : x Let the missing term be ‘x’. 

If a : b = c : d, then a, b, c and d are in proportion, then the product of extremes is equal to the product of means that is a . d = b . c 

⇒ 15 × x = 19 × 45

⇒ x = 19 × 3 

∴ x = 57

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