Proportion



A ratio is simply a comparison between two quantities, obtained by dividing one quantity by the other. Example: The ratio of boys to girls in the class was 4:5

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Proportion Help

A proportion is a name we give to a statement that two ratios are equal.

 To be a proportion the cross products must be equal

Example:
To make 20 pancakes you have to use 2 eggs.
How many eggs are needed to make 80 pancakes?
panc
20 •X = 80 •2
X=160/20
X=8 
A rate is a ratio that is used to compare different kinds of quantities.
Unit rate is a ratio between 2 measurements in which the second term is 1

Unit Rates    Unit Rate    Unit Price    Proportions (unit price)

Two variables are proportional if a change in one is always accompanied by a change in the other.

Ratios in Proportional Relationships   Shadow   Find the missing number    

The relationship between the diameter and circumference of a circle 

measureCirc

Measure the circumference and diameter of circular objects. Find the ratio of circumference to diameter for each object.

Ratio Relationship of π=C/d     

MKY3

 Circumference and Area, 

 Find radius given area,

 Circle problems

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Proportions    

Solving Proportions Word Problems 

 Proportions with integers 

Proportions with Decimals

Proportions in real life – WP3

Proportions in real life – WP6

Proportions in real life – WP10

Proportions in real life – WP11

Proportions in real life – WP13

Proportions in real life – WP15

Proportions in real life – WP16

Scale problems – WP38

Scale problems – WP39

Solving shadow proportions – WP41

Proportions in real life – WP42