One of the mysteries of the English language finally explained.
A method of finding a number in the same ratio to a given number as exists between two other given numbers.
- ‘The mathematics involves a study of proportion and percentages and introduces the rule of three for solving proportion problems.’
- ‘The rule of three is the familiar way of solving problems of this type: if a man earns 50 dinaras in 8 days how much will he earn in 12 days?’
- ‘If the fruit diminish as the requisition increases, or augment as that decreases, they, who are skilled in accounts, consider the rule of three to be inverted.’
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