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x is directly proportional to y if when x is increased (or decreased) by a relative amount then the same relative change occurs in y.

So, if x is doubled, for example, then y is also doubled.

Examples are:

1. Weight is equal to mass * gravity. Here mass and weight are directly proportional (when measured in the same gravitational field). For example, if we double the mass then the weight is also doubled.

2. In electronics there is a law called Ohm's Law which states: voltage = current * resistance (V = IR). Here the voltage is directly proportional to both current and resistance. For example, if we halve either the current or resistance then the voltage is also halved.

There are lots of other examples you could find.

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12y ago
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Q: What are some examples of direct proportion?
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