📐
Proportions
★☆☆☆☆Elementary
📖Definition
An equation stating that two ratios are equal.
📐Formulas
a : b = c : d \iff (a)/(b) = (c)/(d) \iff ad = bc
Proportion and cross multiplication
y = kx
Direct proportion (k is constant of proportionality)
y = (k)/(x)
Inverse proportion
✏️Examples
예제 1★☆☆☆☆
Find x in 3:5 = x:20.
예제 2★☆☆☆☆
If you travel 120km in 4 hours, how far in 6 hours?
⚡Applications
Physics
Speed, force, pressure relationships
Cooking
Scaling recipes
Architecture
Blueprint scaling
🔗Related Documents
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⚡Applications
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