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Math Lesson 4.1.6 - Dividing a Given Ratio

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Welcome to our Math lesson on Dividing a Given Ratio, this is the sixth lesson of our suite of math lessons covering the topic of Ratios, you can find links to the other lessons within this tutorial and access additional Math learning resources below this lesson.

Dividing a Given Ratio

Ratios can be used to divide a given quantity into unequal amounts according the numbers of the ratio. We discussed an example of this at the beginning of this ratio tutorial, when an amount of money has to be shared among three sisters according to a given ratio. Now, let's see another example, this time with geometry.

Example 11

The ratio between the interior angles of a triangle is 2:3:4. Calculate the mass of the greater angle.

Solution 11

From geometry, it is known that the mass of the interior angles in any triangle is 180°. We can denote the angles by a, b and c. Therefore, using the known procedure discussed earlier, we have:

2k + 3k + 4k = 1800
9k = 1800
k = 1800/9 = 200

Hence, the mass of each angle is

a = 2k = 2 × 200 = 400
b = 3k = 3 × 200 = 600
c = 4k = 4 × 200 = 800

More Ratios Lessons and Learning Resources

Ratio and Proportion Learning Material
Tutorial IDMath Tutorial TitleTutorialVideo
Tutorial
Revision
Notes
Revision
Questions
4.1Ratios
Lesson IDMath Lesson TitleLessonVideo
Lesson
4.1.1Definition of a Ratio
4.1.2Ratio in a Number Line
4.1.3Finding the Fraction of One Quantity Out of the Total
4.1.4Part : Whole vs Part : Part Ratios
4.1.5Finding the New Ratio When One Quantity Changes
4.1.6Dividing a Given Ratio

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  2. Ratio and Proportion Math tutorial: Ratios. Read the Ratios math tutorial and build your math knowledge of Ratio and Proportion
  3. Ratio and Proportion Video tutorial: Ratios. Watch or listen to the Ratios video tutorial, a useful way to help you revise when travelling to and from school/college
  4. Ratio and Proportion Revision Notes: Ratios. Print the notes so you can revise the key points covered in the math tutorial for Ratios
  5. Ratio and Proportion Practice Questions: Ratios. Test and improve your knowledge of Ratios with example questins and answers
  6. Check your calculations for Ratio and Proportion questions with our excellent Ratio and Proportion calculators which contain full equations and calculations clearly displayed line by line. See the Ratio and Proportion Calculators by iCalculator™ below.
  7. Continuing learning ratio and proportion - read our next math tutorial: Rates. Applications of Ratios and Rates in Practice

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