Finding the Fourth Proportional to 221.78, 332.68 and 84.80
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Solution
The fourth proportional to 221.78, 332.68 and 84.80 is: 127.20
Step by Step Solution
- Step 1: Write the proportion equation
221.78 : 332.68 = 84.80 : x - Step 2: Convert to fraction form
221.78/332.68 = 84.80/x - Step 3: Cross multiply
221.78x = 332.68 × 84.80 - Step 4: Simplify right side
221.78x = 28,211.26 - Step 5: Solve for x
x = 28,211.26/221.78 - Step 6: Final answer
x = 127.20
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Why These Related Problems?
These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.