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Finding the Fourth Proportional to 578.31, 866.39 and 449.79

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Solution

The fourth proportional to 578.31, 866.39 and 449.79 is: 673.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.31 : 866.39 = 449.79 : x
  2. Step 2: Convert to fraction form
    578.31/866.39 = 449.79/x
  3. Step 3: Cross multiply
    578.31x = 866.39 × 449.79
  4. Step 4: Simplify right side
    578.31x = 389,691.31
  5. Step 5: Solve for x
    x = 389,691.31/578.31
  6. Step 6: Final answer
    x = 673.85

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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.