Question

Find the fourth proportional of:
4 hours 40 minutes, 1 hour 10 minutes and 16 hours

Answer 1

4 hours 40 minutes, 1 hour 10 minutes and 16 hours

It can be written as

4 hours 40 minutes = 4 × 60 + 40 = 240 + 40 = 280minutes

1 hour 10 minutes = 1 × 60 + 10 = 60 + 10 = 70 minutes

16 hours = 16 × 60 = 960 minutes

$\frac{280}{70}=\frac{960}{x}$

So the fourth proportional $=\frac{(70\times 960)}{280}=240$ minutes

We get $=240/60=4$ hours