34/120
34/42 = 90.4762%
2/3
NO. 18/20 is not proportional to 34/40. 18/20 : 34/40 by cross multiplication 18 * 40 = 20 * 34 720 ≠ 680 thus 18/20 is not proportional to 34/40
18/34 = 9/17
34/51 = 2/3
7 over 34
7 over 17
34 over 100...
17
34 over 10
The fraction 12/34 can be simplified to 6/17.