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If quantity A is directly proportional to another quantity B, it means that if B is doubled so is A. When B is tripled so is A. It also works in the other direction; if A is tripled so is B. It works for any factor.

In mathematical terms one may write:

A = C * B

Where C is some numerical constant.

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12y ago
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7y ago

If Y is one variable and X the other then if Y = kX they are directly proportional (k is a constant). If X increases, Y increases. On the other hand if Y = k / X they are inversely proportional (k is a constant). If X increases, Y decreases..

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12y ago

The time it takes you to get to grandma's house in the next city

is inversely proportional to the speed at which you drive there.

double your speed ---> 1/2 the time

triple your speed ---> 1/3 the time

half the speed ---> double the time

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12y ago

It is a relationship between two variables, x and y which is defined by xy = c where c is some constant.

In such a relationship, an increase in x leads to a decrease in y and conversely.

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13y ago

As one value increases, the other decreases; so, if you double one number you have to halve the other number

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15y ago

Two variables are said to be directly proportional if an increase or decrease in one variable causes simultaneous increase or decrease in another variable.

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15y ago

For example the number 5. * A direct proportion would be 5/1 * The inverse would be 1/5

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8y ago

There is no way that you can tell if two numbers are in any sort of proportional relationship. You need a minimum of two sets of ordered pairs.

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