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Finding the Fourth Proportional to 139,062.90, 191,906.60 and 75,400.58

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Solution

The fourth proportional to 139,062.90, 191,906.60 and 75,400.58 is: 104,052.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,062.90 : 191,906.60 = 75,400.58 : x
  2. Step 2: Convert to fraction form
    139,062.90/191,906.60 = 75,400.58/x
  3. Step 3: Cross multiply
    139,062.90x = 191,906.60 × 75,400.58
  4. Step 4: Simplify right side
    139,062.90x = 14,469,868,945.83
  5. Step 5: Solve for x
    x = 14,469,868,945.83/139,062.90
  6. Step 6: Final answer
    x = 104,052.69

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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.