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Finding the Fourth Proportional to 728.76, 1,092.42 and 318.09

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Solution

The fourth proportional to 728.76, 1,092.42 and 318.09 is: 476.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.76 : 1,092.42 = 318.09 : x
  2. Step 2: Convert to fraction form
    728.76/1,092.42 = 318.09/x
  3. Step 3: Cross multiply
    728.76x = 1,092.42 × 318.09
  4. Step 4: Simplify right side
    728.76x = 347,487.88
  5. Step 5: Solve for x
    x = 347,487.88/728.76
  6. Step 6: Final answer
    x = 476.82

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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.