This key facts covers What is Proportion? within Proportion for GCSE Mathematics. Revise Proportion in Number for GCSE Mathematics with 12 exam-style questions and 22 flashcards. Use this page as part of a wider topic revision path rather than treating it as an isolated fact. It is section 2 of 16 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
Topic position
Section 2 of 16
Practice
12 questions
Recall
22 flashcards
What is Proportion?
- Definition: A relationship where one quantity changes in a predictable way when another changes
- Direct proportion: Both quantities increase/decrease together
- Inverse proportion: One increases as the other decreases
- Symbol: ∝ means "is proportional to"
- Constant: k is the constant of proportionality
Keep building this topic
Read this section alongside the surrounding pages in Proportion. That gives you the full topic sequence instead of a single isolated revision point.
Practice Questions for Proportion
y is directly proportional to x. Which equation could represent this relationship?
Explain how you can tell from a graph whether two quantities are in direct or inverse proportion.
Quick Recall Flashcards
12 questions on Proportion — practise free
Instant marking, adaptive difficulty, and 22 spaced repetition flashcards. Free until your GCSEs.
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