Question

what is the 4th proportion of 3hrs12mins,24mins,1m68cm

Answer 1

first convert all this into min(this will make it easy to calculate)


3hrs12mins = 192 min
24mins  = 24 min
1h 68min = 128 min

192:24::128:x
(product of extremes = product of means)
192x = 24*128
192x = 3072
x=3072/192
  = 16
hence 16min