Proportional and inversely proportional situations have interesting mathematical properties. To fully understand these kinds of situations, it is important to master a certain number of concepts, in particular ratios and rates.
Ratios compare two quantities with like units.
Rates compare quantities with unlike (different) units.
For more information on this subject, consult the following concept sheets.
A situation is proportional if there is an equality between two ratios or rates.
In mathematics, a proportion is an equality between two ratios or two rates.
To learn more about proportions and their properties, consult the following concept sheet.
The concept of proportion makes it easier to understand what are called proportional situations. There are two types of proportional situations: directly proportional, and inversely proportional. To learn more about them, see the following concept sheets.
Directly proportional situations sometimes require the use of percentages. Consult the following concept sheet to find out how to solve directly proportional situations that involve percentages, and even how to calculate rebates or taxes.
Pour valider ta compréhension à propos des situations de proportionnalité, des situations inversement proportionnelles et des suites arithmétiques, consulte la MiniRécup suivante.
