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Finding the Fourth Proportional to 728.80, 1,092.93 and 311.88

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Solution

The fourth proportional to 728.80, 1,092.93 and 311.88 is: 467.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.80 : 1,092.93 = 311.88 : x
  2. Step 2: Convert to fraction form
    728.80/1,092.93 = 311.88/x
  3. Step 3: Cross multiply
    728.80x = 1,092.93 × 311.88
  4. Step 4: Simplify right side
    728.80x = 340,865.94
  5. Step 5: Solve for x
    x = 340,865.94/728.80
  6. Step 6: Final answer
    x = 467.71

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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.