let the numbers be x, y , z
So 1/2 x = 1/3 y = 1/4 z = k
x = 2k , y = 3k , z = 4k
Also,
x+y+z = 243
2k+3k+4k = 243
9k = 243
k = 27
So numbers are x = 54 , y = 81 , z = 108