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Finding the Fourth Proportional to 3,127.78, 4,691.67 and 819.28

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Solution

The fourth proportional to 3,127.78, 4,691.67 and 819.28 is: 1,228.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,127.78 : 4,691.67 = 819.28 : x
  2. Step 2: Convert to fraction form
    3,127.78/4,691.67 = 819.28/x
  3. Step 3: Cross multiply
    3,127.78x = 4,691.67 × 819.28
  4. Step 4: Simplify right side
    3,127.78x = 3,843,791.40
  5. Step 5: Solve for x
    x = 3,843,791.40/3,127.78
  6. Step 6: Final answer
    x = 1,228.92

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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.