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Finding the Fourth Proportional to 577.40, 864.22 and 439.70

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Solution

The fourth proportional to 577.40, 864.22 and 439.70 is: 658.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    577.40 : 864.22 = 439.70 : x
  2. Step 2: Convert to fraction form
    577.40/864.22 = 439.70/x
  3. Step 3: Cross multiply
    577.40x = 864.22 × 439.70
  4. Step 4: Simplify right side
    577.40x = 379,997.53
  5. Step 5: Solve for x
    x = 379,997.53/577.40
  6. Step 6: Final answer
    x = 658.12

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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.