X:1/2=3:5 x:2/3=3:4 12:29=1/58:x
12:29 = 1/58:Х 12х = 29 * 1/58 12х = 29/58 12х=1/2 х = 1/2: 12/1 х = 1/2 * 1/12 х = 1/24 Ответ: 1/24