3:0.250.8:1 and 5:7.4:3:1.25 3:7:4 reduction ratio

1/3：0.25＝1/3：1/4＝（1/3）*12：（1/4）*12＝4：3
8:1 and 7 / 5 = 4 / 5:12 / 5 = (4 / 5) * 5: (12 / 5) * 5 = 4:12 = 1:3
3/4：1.25＝3/4：5/4＝（3/4）*4：（5/4）*4＝3：5
3：4/7＝（3*7）：（4/7）*7＝21：4

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