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Question
Find the fourth proportional of 4 hours 40 minutes, 1 hour 10 minutes and 16 hours.
Solution
Fourth proportional of 4 hours 40 minutes, 1 hour 10 minutes and 16 hours.
4 hours 40 minutes = 4 × 60 + 40
= 240 40 = 280
1 hour 10 minutes = 1 × 60 + 10
= 60 + 10 = 70 minutes
16 hours = 16 × 60 = 960 minutes
∴ Fourth proportional = `(70 xx 960)/280`
= 240 minutes = `240/60` = 4 hours
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