Proportions
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Two quatities which vary together are said to have proportionality
with each other. Proportionality between two values is shown using the
symbol: 
which means is proportional to. There are several types of proportionality.
- Direct Proportion
a b means a is directly proportional to b. This means as a changes so does b. The connection involves a constant which can be seen as a = kb where k is the constant of proportionality. When a and b are plotted on a graph it gives a straight line which passes through (0,0) and has a gradient of k.
- Inverse Proportion
a 1/b means a is inversely proportional to b. This means as a increases b decreases. This connection involves a division which can be seen as a = k/b where k is the constant of proportionality. When a and b are plotted on a graph it should give a reciprocal graph.
These are the basics of proportionality. There are many more types of proportionality and many thing connected to it. You should do more in depth revision of this subject.
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by: Admin
Total views: 625
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Date: Thu, 14 Sep 2006 Time: 12:00 AM
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