There are many.
Two simplest ones are:
10:14
15:21
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You can produce an infinite number of ratios that are equal 3:7. You can do this by simply multiplying both 3 and 7 by the same number, so for example: 3 x 2:7 x 2 6:14 = 3:7 3 x 5:7 x 5 15:35 = 3:7
They are: 20 to 14 and 30 to 21
They are: 10 to 14 and 15 to 21
21 : 7 = 42 : 14
2:7