To convert medication dosages from one quantity to another, the nurse must know how to use ratio and proportion. Which of the following is true about the ratio 2:4 :: 1:2
A) This represents two unequal ratios separated by a double colon.
B) The numbers 4 and 2 are referred to as the extremes.
C) The numbers 2 and 2 are referred to as the means.
D) The proportion is referred to as a "valuable relationship."
D
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This is a valuable relationship. When written with the double colon, the first and last numbers are referred to as the extremes and the second and third (middle) numbers are the means. A true proportion consists of two equal ratios separated by an equals sign (=) or a double colon (::).
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