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Finding the Fourth Proportional to 512.60, 768.92 and 315.39

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Solution

The fourth proportional to 512.60, 768.92 and 315.39 is: 473.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.60 : 768.92 = 315.39 : x
  2. Step 2: Convert to fraction form
    512.60/768.92 = 315.39/x
  3. Step 3: Cross multiply
    512.60x = 768.92 × 315.39
  4. Step 4: Simplify right side
    512.60x = 242,508.10
  5. Step 5: Solve for x
    x = 242,508.10/512.60
  6. Step 6: Final answer
    x = 473.10

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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.