How to solve
In a proportion the cross products are equal: a/b = x/c means a·c = b·x.
Steps
- Cross-multiply the two diagonals.
- Set the products equal.
- Divide to isolate the unknown.
Example
Solve 3/4 = x/20.
- Cross products: 3 · 20 = 4x.
- 60 = 4x, so x = 15.
Answer: 15
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