## Wednesday, October 12, 2011

### Ronalen's Proportion Post

Ratio: compares two quantities measured in the same units.
written as a:b or a to b.

Three term ratios: compares three quantities measured in the same units.
written as a:b:c or a to be to c.

Part to part ratio: compares different parts of a group to each other
10:8 is the part to part ratio of brown to red beads.

Part to whole ratio: compares one part of the group to the whole group.
5:23 is the part to whole ratio of blue to total number of beads.

Rate: rates are a comparison of two quantities measured in different units.
EX.\$1.69 per 100g or \$1.69/100g rate for purchasing bulk foods.

Unit rate: is the

Proportion: a proportion is an equation which states that two ratios or fractions are equal.

1. 5 hours to travel 360 miles is about _____mph
2. As a playgroup worker, if I increase the amount of apple juice I am serving at the playgroup from 25 ml to 100 ml, how much should I increase the the orange juice to, to keep the quantities in the same proportion? The orange juice is 50 ml to start with.

Question 1: 5 hours to travel 360 miles is about 72 mph because if you divide 360 by 5 you get 72 miles per hour.

Question 2: as a playgroup worker you increase the amount of apple juice from 25ml to 100ml
if I increase the amount of orange juice and the orange juice is 50ml i will increase the amount to 200 because when you multiply 25 by four you get 100. If you multiply 50 by 4 you get 200.

Three ways you can prove that equivalent ratios are true......

3 /4 = 12 /16 or 4 /9 = 16 /32 you can prove this is true by multiplying diagonally and if you get the same number for both sides it is equivalent. you can do that vertically and horizontally.

Here is a video on a way to figure out a proportion.
Hope this helps you.

This picture up here shows a social injustice.

Question 1 answer: this is absolutely unfair just because someone is poor or homeless it doesn't mean you can treat them like garbage.

Question 2 answer: this is not just and fair because the man who stole 3 billion dollars only got about 3 years in jail. A man who stole 100 dollars and later turned himself into the police got 15 years in jail.

Question 3 answer: if i was the judge i would have the man who stole 3 billion dollars the rest of his life in jail. i would have given the man who stole 100 dollars about 2 years in jail.

Thank you for reading my post. :)