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Finding the Fourth Proportional to 138,610.62, 191,289.15 and 78,179.94

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Solution

The fourth proportional to 138,610.62, 191,289.15 and 78,179.94 is: 107,891.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,610.62 : 191,289.15 = 78,179.94 : x
  2. Step 2: Convert to fraction form
    138,610.62/191,289.15 = 78,179.94/x
  3. Step 3: Cross multiply
    138,610.62x = 191,289.15 × 78,179.94
  4. Step 4: Simplify right side
    138,610.62x = 14,954,974,269.65
  5. Step 5: Solve for x
    x = 14,954,974,269.65/138,610.62
  6. Step 6: Final answer
    x = 107,891.98

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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.