Curriculum
Mathematics — First Preparatory
Unit 1: Numbers
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Ratio and Proportion
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Ratio and Proportion — Lesson quiz
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Applications of Ratio and Proportion
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Applications of Ratio and Proportion — Lesson quiz
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Sets and Operations on Sets
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Sets and Operations on Sets — Lesson quiz
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Operations on Integers
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Operations on Integers — Lesson quiz
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Operations on Rational Numbers
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Operations on Rational Numbers — Lesson quiz
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Unit 2: Algebra
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Unit 3: Statistics
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Unit 4: Geometry
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Text lesson
Ratio and Proportion
Ratio and Proportion
Solving proportion equations
Solving proportion equations
- When a proportion contains an unknown
- we use the rule of extremes and means and
- solve the resulting equation in the usual way.
- Write the product of the extremes equal to the product of the means.
- Isolate the unknown by dividing both sides by the number that multiplies it.
- Check the answer by substituting it back into the original proportion.
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