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Finding the Fourth Proportional to 121,791.61, 168,073.41 and 68,078.89

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Solution

The fourth proportional to 121,791.61, 168,073.41 and 68,078.89 is: 93,949.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,791.61 : 168,073.41 = 68,078.89 : x
  2. Step 2: Convert to fraction form
    121,791.61/168,073.41 = 68,078.89/x
  3. Step 3: Cross multiply
    121,791.61x = 168,073.41 × 68,078.89
  4. Step 4: Simplify right side
    121,791.61x = 11,442,251,191.31
  5. Step 5: Solve for x
    x = 11,442,251,191.31/121,791.61
  6. Step 6: Final answer
    x = 93,949.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.