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Finding the Fourth Proportional to 139,793.20, 192,908.02 and 79,355.86

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Solution

The fourth proportional to 139,793.20, 192,908.02 and 79,355.86 is: 109,507.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,793.20 : 192,908.02 = 79,355.86 : x
  2. Step 2: Convert to fraction form
    139,793.20/192,908.02 = 79,355.86/x
  3. Step 3: Cross multiply
    139,793.20x = 192,908.02 × 79,355.86
  4. Step 4: Simplify right side
    139,793.20x = 15,308,381,828.00
  5. Step 5: Solve for x
    x = 15,308,381,828.00/139,793.20
  6. Step 6: Final answer
    x = 109,507.34

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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.