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Finding the Fourth Proportional to 728.46, 1,092.81 and 338.85

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Solution

The fourth proportional to 728.46, 1,092.81 and 338.85 is: 508.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.46 : 1,092.81 = 338.85 : x
  2. Step 2: Convert to fraction form
    728.46/1,092.81 = 338.85/x
  3. Step 3: Cross multiply
    728.46x = 1,092.81 × 338.85
  4. Step 4: Simplify right side
    728.46x = 370,298.67
  5. Step 5: Solve for x
    x = 370,298.67/728.46
  6. Step 6: Final answer
    x = 508.33

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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.