# Ratio and Proportion: In a Nutshell (Nursing)

by Rhonda Lawes

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Slides Nursing Dosage Calculation Ratio Proportion.pdf
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Cheat Sheet Understanding Ratios.pdf
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00:00 Okay. So, let's wrap up this part of the video series.

00:03 Remember ratio is just a number that describes the relationship between the two numbers.

00:09 Remember we looked at tennis balls and Harleys.

00:12 Now, learning this concept is the first step in understanding how to solve for x in an unknown number.

00:19 The reason you care about that is we need that skill to discover how to identify safe dosage calculation for your patients.

00:28 Now medications and solutions are also described using ratios.

00:33 So epinephrine, 1:10,000 means that there's one part of medication, the epinephrine, and 10,000 parts of solution. So does 3:4 equals 6:8? Well, in order to determine if a ratio is equal, you multiply the means which are in the middle times the extremes.

00:52 Cross multiplication of the ratios as fractions will help you determine if they are equal and a proportion.

00:59 Remember, that's what we want for safely identifying the correct dose for our patients.

01:05 So in proportions, the product of the means always equals the product of the extremes.

01:11 That's the theory behind safe and effective medication dosage calculation.

01:18 Thanks for watching our video today.

The lecture Ratio and Proportion: In a Nutshell (Nursing) by Rhonda Lawes is from the course Dosage Calculation (Nursing).

### Included Quiz Questions

1. Ratio
2. Mean
3. Extreme
4. Proportion

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