Proportions

Proportion is the equality of two relationships.

Consider two equal relationships:

Combining them with the equal sign, we get the proportion.

In proportion distinguish extreme and average members .

• 8 and 5 are called extreme members.
• 4 and 10 are middle members.

The main property of proportion

If the proportion is correct, that is, the relations that make up this proportion are really equal, then for the proportion the following is true:

In order to properly apply the rule, we suggest you remember the rule (cross) of the "X".

Consider it on the example of proportion.

Make sure the proportion is correct.

Now write down the proportion and draw a cross over the equal sign with a pencil.

Having drawn a cross, it is much easier to compose the desired work (to fulfill the basic property of proportion).