## Tuesday, October 11, 2011

### Lances Proportion Post

ratio: the relation between two similar magnitudes with respect to the number of times the first contains the second eg. the ratio of 5 to 2, written 5:2 or 5/2.

rate: A ratio that compares two quantities measured in different units eg 15 to 20 or 15:20

proportion: comparative relation between things or magnitudes as to size, quantity, number, etc.; ratio.

1) 5 hours to travel 360 miles is about  72 mph

÷2
hrs      5         1
----    ----- = -----
miles  360     72
÷2
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.

x4
apple j    25ml   100ml
---------   --------- = ----------       You should increase 50 to 200 ml of orange juice
orange j   50ml   200ml
x4

3)What are the three ways you can prove that equivalent ratio statements are true? 3/4=12/16 diagonally (multiply top left and bottom right) vertically, and horizontally.

4)

5)