1. X ∶ 21 = 派行知6 ∶ 14
解：X = (21 × 派行知6) ÷ 14
2. X ∶ 4/5 = 5/12 ∶ 10
解：X = (5/12 × 4/5) ÷ 10
3. 26 ∶ X = 1 ∶ 2
解：X = 26 ÷ 1 × 2
4. 2 ∶ 120 = 1 ∶ X
解：X = 120 ÷ 2
5. 5 ∶ X = 10 ∶ 15
解：X = (5 × 15) ÷ 10
6. 7.5/1.5 = X ∶ 3
解：X = (7.5 × 3) ÷ 1.5
7. 1/6 ∶ 1/3 = 1/5 ∶ X
解：X = (1/6 × 1/3) ÷ 1/5
8. X ∶ 24 = 3 ∶ 8
解：X = (3 × 24) ÷ 8
9. 1/2 ∶ 1/3 = X ∶ 1/2
解：X = (1/2 × 1/2) ÷ 1/3
10. 12 ∶ X = 18 ∶ 6
解：X = (12 × 6) ÷ 18
11. 4 ∶ 8 = 5 ∶ X
解：X = (4 × 5) ÷ 8
12. (X - 10) ∶ (Y + 10) = 7 ∶ 5
解：X = (7 × (Y + 10)) + 10 ÷ 5
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