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Finding the Fourth Proportional to 122,399.82, 168,910.17 and 68,685.90

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Solution

The fourth proportional to 122,399.82, 168,910.17 and 68,685.90 is: 94,785.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    122,399.82 : 168,910.17 = 68,685.90 : x
  2. Step 2: Convert to fraction form
    122,399.82/168,910.17 = 68,685.90/x
  3. Step 3: Cross multiply
    122,399.82x = 168,910.17 × 68,685.90
  4. Step 4: Simplify right side
    122,399.82x = 11,601,747,045.60
  5. Step 5: Solve for x
    x = 11,601,747,045.60/122,399.82
  6. Step 6: Final answer
    x = 94,785.65

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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.