Learning Target 

• Use proportional reasoning to solve equations.

Defintion(you'll need to no this to understand my scribe post)

• Proportion-an equation that states that two ratios are equal
Lesson

You can use proportions to help your self solve algebraic equations.Here is an example:

4/8=1/2 or 4:8=1:2 an algebraic equation could be 1/2=x/8. to find what x equals you can use these steps:

1. divide 8 by 2 which would equal 4,
2. Next since your answer is 4 multiply 4 time 1which equals 4,
3. So x equals four.

Anothere way to solve it is cross multiplication:

• 3/4=x/12, the first step is to multiply the numberdiagonal from it 3*12=36 4*x=36,
• to get x you simply divide 36 by 4 which equals 9.

Quick Tips

• Proprtion compares ratios
• A proportion always has an equal sign

Links

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Posted by: akinbim    in: My entries

Modified on May 16, 2007 at 10:56 PM