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Finding the Fourth Proportional to 121,860, 168,189.84 and 68,868

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Solution

The fourth proportional to 121,860, 168,189.84 and 68,868 is: 95,050.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,860 : 168,189.84 = 68,868 : x
  2. Step 2: Convert to fraction form
    121,860/168,189.84 = 68,868/x
  3. Step 3: Cross multiply
    121,860x = 168,189.84 × 68,868
  4. Step 4: Simplify right side
    121,860x = 11,582,897,901.12
  5. Step 5: Solve for x
    x = 11,582,897,901.12/121,860
  6. Step 6: Final answer
    x = 95,050.86

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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.