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3:5

To solve partitive proportion, first you must add 3 and 5 to a total, but if you are going to add both of them, you will put x on it, so that it can balance the relationship.

Example:

A piece of wood was in the length of 204, with a ratio of 1:5. Find the measurements.

First add them, then place x or n or any variable.

1x+5x=204

Then add all terms

6x=204

Divide both sides by 6

x=34

Substitute the value:

34:170

then simplify

1:5

Hope this helps =)