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Finding the Fourth Proportional to 512.24, 768.20 and 439.92

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Solution

The fourth proportional to 512.24, 768.20 and 439.92 is: 659.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.24 : 768.20 = 439.92 : x
  2. Step 2: Convert to fraction form
    512.24/768.20 = 439.92/x
  3. Step 3: Cross multiply
    512.24x = 768.20 × 439.92
  4. Step 4: Simplify right side
    512.24x = 337,946.54
  5. Step 5: Solve for x
    x = 337,946.54/512.24
  6. Step 6: Final answer
    x = 659.74

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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.