Why This Matters for Nursing: Medication mixing, IV drip rates, and staffing calculations all use ratios. "Mix 1 part medication to 3 parts saline" or "1 nurse for every 4 patients" are ratios you'll use daily.
A ratio compares two quantities. It can be written three ways: - 1 to 3 - 1:3 - 1/3
A proportion states that two ratios are EQUAL: - 1:3 = 2:6 (both simplify to the same ratio)
Cross multiply to solve proportions!
If a/b = c/d, then a × d = b × c
Think of it as an "X" — multiply across the diagonal!
"Cross products are equal"
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