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Finding the Fourth Proportional to 439.11, 605.34 and 386.91

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Solution

The fourth proportional to 439.11, 605.34 and 386.91 is: 533.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.11 : 605.34 = 386.91 : x
  2. Step 2: Convert to fraction form
    439.11/605.34 = 386.91/x
  3. Step 3: Cross multiply
    439.11x = 605.34 × 386.91
  4. Step 4: Simplify right side
    439.11x = 234,212.10
  5. Step 5: Solve for x
    x = 234,212.10/439.11
  6. Step 6: Final answer
    x = 533.38

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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.