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Finding the Fourth Proportional to 512.20, 767.39 and 338.61

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Solution

The fourth proportional to 512.20, 767.39 and 338.61 is: 507.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.20 : 767.39 = 338.61 : x
  2. Step 2: Convert to fraction form
    512.20/767.39 = 338.61/x
  3. Step 3: Cross multiply
    512.20x = 767.39 × 338.61
  4. Step 4: Simplify right side
    512.20x = 259,847.11
  5. Step 5: Solve for x
    x = 259,847.11/512.20
  6. Step 6: Final answer
    x = 507.31

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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.