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Finding the Fourth Proportional to 512.78, 769.05 and 238.61

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Solution

The fourth proportional to 512.78, 769.05 and 238.61 is: 357.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    512.78 : 769.05 = 238.61 : x
  2. Step 2: Convert to fraction form
    512.78/769.05 = 238.61/x
  3. Step 3: Cross multiply
    512.78x = 769.05 × 238.61
  4. Step 4: Simplify right side
    512.78x = 183,503.02
  5. Step 5: Solve for x
    x = 183,503.02/512.78
  6. Step 6: Final answer
    x = 357.86

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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.