The logic of proportions: why scaling up ratios preserves their essence
In short: Master the mechanics of ratio expansion for upcoming exams. This video explains how to multiply parts of a ratio equally to maintain equivalence, a fundamental skill for solving complex multi-part problems.
Scaling up is conceptually the inverse of simplifying a ratio. To scale a ratio correctly, you must multiply every individual part by the same constant number. This ensures that while the quantities increase, the relationship between them remains identical.
The tutorial covers practical applications for GCSE Foundation and Higher tiers, including finding unknown quantities when only one part is provided, calculating new totals after expansion, and managing ratios with more than two parts.
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Sources
- Summary by Intellect · source: GCSE Maths - How to Scale Up Ratios (2026/27 exams)
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