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Finding the Fourth Proportional to 139,049.82, 191,890.08 and 75,387.78

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Solution

The fourth proportional to 139,049.82, 191,890.08 and 75,387.78 is: 104,035.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,049.82 : 191,890.08 = 75,387.78 : x
  2. Step 2: Convert to fraction form
    139,049.82/191,890.08 = 75,387.78/x
  3. Step 3: Cross multiply
    139,049.82x = 191,890.08 × 75,387.78
  4. Step 4: Simplify right side
    139,049.82x = 14,466,167,135.22
  5. Step 5: Solve for x
    x = 14,466,167,135.22/139,049.82
  6. Step 6: Final answer
    x = 104,035.86

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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.