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Finding the Fourth Proportional to 121,782.62, 168,067.89 and 68,069.90

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Solution

The fourth proportional to 121,782.62, 168,067.89 and 68,069.90 is: 93,940.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,782.62 : 168,067.89 = 68,069.90 : x
  2. Step 2: Convert to fraction form
    121,782.62/168,067.89 = 68,069.90/x
  3. Step 3: Cross multiply
    121,782.62x = 168,067.89 × 68,069.90
  4. Step 4: Simplify right side
    121,782.62x = 11,440,363,625.17
  5. Step 5: Solve for x
    x = 11,440,363,625.17/121,782.62
  6. Step 6: Final answer
    x = 93,940.86

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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.