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Finding the Fourth Proportional to 728.73, 1,092.74 and 317.69

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Solution

The fourth proportional to 728.73, 1,092.74 and 317.69 is: 476.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    728.73 : 1,092.74 = 317.69 : x
  2. Step 2: Convert to fraction form
    728.73/1,092.74 = 317.69/x
  3. Step 3: Cross multiply
    728.73x = 1,092.74 × 317.69
  4. Step 4: Simplify right side
    728.73x = 347,149.62
  5. Step 5: Solve for x
    x = 347,149.62/728.73
  6. Step 6: Final answer
    x = 476.38

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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.