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Finding the Fourth Proportional to 728.34, 1,092.18 and 317.28

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Solution

The fourth proportional to 728.34, 1,092.18 and 317.28 is: 475.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.34 : 1,092.18 = 317.28 : x
  2. Step 2: Convert to fraction form
    728.34/1,092.18 = 317.28/x
  3. Step 3: Cross multiply
    728.34x = 1,092.18 × 317.28
  4. Step 4: Simplify right side
    728.34x = 346,526.87
  5. Step 5: Solve for x
    x = 346,526.87/728.34
  6. Step 6: Final answer
    x = 475.78

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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.