Rule of three — direct proportion
Rule of three — direct proportion
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Fill in the missing number. Direct proportion: when one quantity grows, the other grows in the same ratio.
| 3 | → | 15 |
| 7 | → |
What does this generator do?
The generator shows a "value → result" pair on the top row. The bottom row has a different value and a question mark. Work out the answer using direct proportion.
How to solve it
From the first pair, find what corresponds to one unit (divide). Then multiply this per-unit value by the second number in the left column. This is the classic "rule of three".
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