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Finding the Fourth Proportional to 439.13, 605.67 and 391.91

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Solution

The fourth proportional to 439.13, 605.67 and 391.91 is: 540.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.13 : 605.67 = 391.91 : x
  2. Step 2: Convert to fraction form
    439.13/605.67 = 391.91/x
  3. Step 3: Cross multiply
    439.13x = 605.67 × 391.91
  4. Step 4: Simplify right side
    439.13x = 237,366.17
  5. Step 5: Solve for x
    x = 237,366.17/439.13
  6. Step 6: Final answer
    x = 540.54

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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.