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Finding the Fourth Proportional to 439.38, 605.34 and 351.90

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Solution

The fourth proportional to 439.38, 605.34 and 351.90 is: 484.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.38 : 605.34 = 351.90 : x
  2. Step 2: Convert to fraction form
    439.38/605.34 = 351.90/x
  3. Step 3: Cross multiply
    439.38x = 605.34 × 351.90
  4. Step 4: Simplify right side
    439.38x = 213,019.15
  5. Step 5: Solve for x
    x = 213,019.15/439.38
  6. Step 6: Final answer
    x = 484.82

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.