expresses in numbers the relationship between two things. It shows how
big or small something is in relation to something else. For example,
the female to male ratio at one of our
colleges is 2 to 1 (2 males for every female).
The term "proportion"
also refers to the relationship between to things. If something is in
proportion, it maintains the same relationship to something else. For
example, your tax increases in proportion to your income.
Right click the image
below. From the choices you have listed, select PROPERTIES.
Under the PROPERTIES
box, find the Dimensions of the image,
expressed in PIXELS (Smallest units of an image).
1. Write the dimensions
(width X height) in the box:
If I want to keep the
same proportions in the image when I make it smaller, I need to
divide both the width and the height by the same amount.
In other words, if I
want to make the image half as small, I need to divide both the
height and the width by 1/2, 50% or .50. If I don't the proportions
will change, and the image may look like one of the pictures below:
If I divide both
dimensions by the same amount, I will keep the same proportion, as
2. Click on the image
above and check the dimensions.
Are the dimensions half
of the original image? Did I keep the same proportions in the
Practice keeping the
same proportions as you change the sizes in the following figures.
Check the dimensions of the shapes below.
What would be the dimensions of a square twice as big?
What would be the dimensions of a rectangle one-third of the size of
this one ?
When we express rations,
we often use a colon ":" to separate the two numbers. Six
feet to two yards would be expressed as 6:2.
Example: 6 feet to 2
multiplied or divided each side by the same amount and kept the same
We'll work more with
ratios and proportions next time!
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