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Finding the Fourth Proportional to 574.64, 861.96 and 391.58

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Solution

The fourth proportional to 574.64, 861.96 and 391.58 is: 587.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    574.64 : 861.96 = 391.58 : x
  2. Step 2: Convert to fraction form
    574.64/861.96 = 391.58/x
  3. Step 3: Cross multiply
    574.64x = 861.96 × 391.58
  4. Step 4: Simplify right side
    574.64x = 337,526.30
  5. Step 5: Solve for x
    x = 337,526.30/574.64
  6. Step 6: Final answer
    x = 587.37

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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.