Proportion Math
Example

Keep in mind that proportion math is an equation where
both ratios are equal. In order for everything to work out correctly, all of the terms must be the same. Sometimes it will be necessary to convert grams to milligrams or liters to milliliters, etc.





Question:

How many 200mg tablets would be required to make 1.5 liters of a 1:250 solution?

A 1:250 solution would look like this:

1 gram

250mL


So, this question is solved with
proportions math:

1 gram
       
?

    =   

250mL
       
1500mL


Do the math:

1 gram
       
6 grams

    =   

250mL
       
1500mL


Now figure out how many 200mg Tabs = 6 grams.

Answer is 30 tabs









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