Properties+of+Proportions+P4

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Properties of Proportions

Paige Drummond Sydney Campo Melissa Le

Proportion: an equation that relates two ratios

a/b=c/d: a, b, c, d are nonzero a and d are called extremes b and c are called means

Properties of Proportions: >
 * 1) Cross Product: if a/b=c/d, then ad=bc
 * 2) Reciprocal Property: if a/b=c/d, then b/a= d/c
 * 3) Interchange Means Property: If a/b= c=d, then a/c=b/d
 * 4)  If a/b=c/d, then a+b/b= c+d/d

Melissa Le http://www.cliffsnotes.com/study_guide/Properties-of-Proportions.topicArticleId-18851,articleId-18810.html This is website is helpful by explaining the properties of proportions, but also having examples after each that explain what each step is.

http://www.algebrahelp.com/worksheets/view/proportionbasics.quiz This website is also helpful by giving you problems that you have to do, and if you can't figure it out, you can see how it's done step-by-step.

http://www.vhstigers.org/ourpages/auto/2006/6/20/1150817470106/Geometry%207-2%20Properties%20of%20Proportions.pdf

Paige Drummond: This PDF file has a lesson overview and a ton of problems for lots of practice.