### Convert ratio into mg per mL expression

3. Percent, Ratio, mg/mL, PPM, PPB 3.2) Ratio 3.2.1) Ratio - General

3.2.1.1) Ratio - General Normal 1

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A medication is expressed as 1 : 720. Express this in mg/mL strength

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lb equals 1.389 mg/mL kg

1 : 720 means, 1 g of drug is present in each 720 mL of the solution.

First, determine the gram amount of drug present per 1 mL of the solution. Then, the gram will be changed to mg. therefore (1 \quad g)/(720 \quad mL)=x/(1 \quad mL) therefore x = 1/720  g.

Now, convert this gram unit into mg unit:
(1000\quad mg)/(1\quad g) = y/(1/720\quad g)
therefore y = 1.389 mg.
therefore 1.389 mg/mL is the answer.

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