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Finding the Fourth Proportional to 512.41, 768.61 and 219.88

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Solution

The fourth proportional to 512.41, 768.61 and 219.88 is: 329.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.41 : 768.61 = 219.88 : x
  2. Step 2: Convert to fraction form
    512.41/768.61 = 219.88/x
  3. Step 3: Cross multiply
    512.41x = 768.61 × 219.88
  4. Step 4: Simplify right side
    512.41x = 169,004.64
  5. Step 5: Solve for x
    x = 169,004.64/512.41
  6. Step 6: Final answer
    x = 329.83

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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.