8 1/2 : ( 8 1/6 * 9 3/2)

8 1/2 : (8 1/6 * 9 3/2) = 34/343
1) 8 1/6 * 9 3/2 = 49/6 * 21/2 = 1029/12 = 85 9/12 = 85 3/4
2) 8 1/2 : 85 3/4 = 17/2 : 343/4 = 17/2 * 4/343 = 34/343