5:15 Direct and Inverse Proportion Explained for IGCSE and GCSE Maths
Worked examples with square roots and cubes — exactly the powers-and-roots proportion this lesson needs.
Direct proportion to the power or root of a variable
Write and use equations involving direct proportion to the square or cube of a variable
4 hand-picked video lessons for this topic, each checked for relevance and clarity, graded by difficulty and labelled by depth. Press play to watch — nothing loads from YouTube until you do.
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4 shown 5:15 
2:04 Directly proportional to the square root
A focused walkthrough of solving a proportion problem involving a square root.
18:45 Direct and Inverse Proportion | Grade 7-9 Series | GCSE Maths Tutor
Grade 7-9 Higher proportion techniques, ideal preparation for the harder powers-and-roots questions.
27:16 Direct/Inverse Proportion - GCSE Higher Maths
Thorough Higher-tier direct and inverse proportion, building the full method with the constant k.