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Finding the Fourth Proportional to 439.17, 605.91 and 397.59

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Solution

The fourth proportional to 439.17, 605.91 and 397.59 is: 548.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.17 : 605.91 = 397.59 : x
  2. Step 2: Convert to fraction form
    439.17/605.91 = 397.59/x
  3. Step 3: Cross multiply
    439.17x = 605.91 × 397.59
  4. Step 4: Simplify right side
    439.17x = 240,903.76
  5. Step 5: Solve for x
    x = 240,903.76/439.17
  6. Step 6: Final answer
    x = 548.54

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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.