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Finding the Fourth Proportional to 728.21, 1,092.11 and 317.25

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Solution

The fourth proportional to 728.21, 1,092.11 and 317.25 is: 475.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.21 : 1,092.11 = 317.25 : x
  2. Step 2: Convert to fraction form
    728.21/1,092.11 = 317.25/x
  3. Step 3: Cross multiply
    728.21x = 1,092.11 × 317.25
  4. Step 4: Simplify right side
    728.21x = 346,470.31
  5. Step 5: Solve for x
    x = 346,470.31/728.21
  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.