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In addition to the revision notes for Properties of Proportion. Geometric Mean on this page, you can also access the following Ratio and Proportion learning resources for Properties of Proportion. Geometric Mean
|4.4||Properties of Proportion. Geometric Mean|
In these revision notes for Properties of Proportion. Geometric Mean, we cover the following key points:
Proportions have a number of useful properties that help calculate easier any missing quantity involved in them. They are as follows:
Swapping the means in a proportion still provides a proportion
Swapping the extremes in a proportion still provides a proportion
Inverting both ratios in a proportion still provides a proportion
Adding or subtracting the corresponding denominator to the numerator of each ratio in a proportion still provides a proportion
Multiplying up and down one or both ratios in a proportion with the same number (they can be different in each side), provides a new proportion
The condition for this property to be true is that both m and n must not be zero.
If we have the following proportion
then, we can express it as
Sometimes one of terms in a proportion is missing; in this case, we have to calculate it. We call the missing term the n-th proportional of the number set given in the proportion. It is calculated by using any of the properties of proportion.
If we have a proportion that meets the condition
then, the number x is called the geometric mean of a and b. It is calculated by the formula
If the proportion is made by more than two fractions, then the geometric mean is
Geometric mean is a very important concept used in finance and banking. More specifically, the geometric mean is extremely useful when numbers in the series are not independent of each other or if numbers tend to make large fluctuations.
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