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Finding the Fourth Proportional to 728.96, 1,092.68 and 318.28

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Solution

The fourth proportional to 728.96, 1,092.68 and 318.28 is: 477.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.96 : 1,092.68 = 318.28 : x
  2. Step 2: Convert to fraction form
    728.96/1,092.68 = 318.28/x
  3. Step 3: Cross multiply
    728.96x = 1,092.68 × 318.28
  4. Step 4: Simplify right side
    728.96x = 347,778.19
  5. Step 5: Solve for x
    x = 347,778.19/728.96
  6. Step 6: Final answer
    x = 477.09

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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.