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Finding the Fourth Proportional to 68,862.78, 103,285.98 and 18,947.97

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Solution

The fourth proportional to 68,862.78, 103,285.98 and 18,947.97 is: 28,419.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,862.78 : 103,285.98 = 18,947.97 : x
  2. Step 2: Convert to fraction form
    68,862.78/103,285.98 = 18,947.97/x
  3. Step 3: Cross multiply
    68,862.78x = 103,285.98 × 18,947.97
  4. Step 4: Simplify right side
    68,862.78x = 1,957,059,650.46
  5. Step 5: Solve for x
    x = 1,957,059,650.46/68,862.78
  6. Step 6: Final answer
    x = 28,419.70

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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.