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Finding the Fourth Proportional to 139,224.36, 192,129.50 and 78,793.90

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Solution

The fourth proportional to 139,224.36, 192,129.50 and 78,793.90 is: 108,735.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,224.36 : 192,129.50 = 78,793.90 : x
  2. Step 2: Convert to fraction form
    139,224.36/192,129.50 = 78,793.90/x
  3. Step 3: Cross multiply
    139,224.36x = 192,129.50 × 78,793.90
  4. Step 4: Simplify right side
    139,224.36x = 15,138,632,610.05
  5. Step 5: Solve for x
    x = 15,138,632,610.05/139,224.36
  6. Step 6: Final answer
    x = 108,735.52

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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.