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Finding the Fourth Proportional to 439.11, 657.58 and 255.95

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Solution

The fourth proportional to 439.11, 657.58 and 255.95 is: 383.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.11 : 657.58 = 255.95 : x
  2. Step 2: Convert to fraction form
    439.11/657.58 = 255.95/x
  3. Step 3: Cross multiply
    439.11x = 657.58 × 255.95
  4. Step 4: Simplify right side
    439.11x = 168,308.61
  5. Step 5: Solve for x
    x = 168,308.61/439.11
  6. Step 6: Final answer
    x = 383.29

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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.