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Finding the Fourth Proportional to 139,161.81, 192,052.81 and 78,732.44

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Solution

The fourth proportional to 139,161.81, 192,052.81 and 78,732.44 is: 108,656.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,161.81 : 192,052.81 = 78,732.44 : x
  2. Step 2: Convert to fraction form
    139,161.81/192,052.81 = 78,732.44/x
  3. Step 3: Cross multiply
    139,161.81x = 192,052.81 × 78,732.44
  4. Step 4: Simplify right side
    139,161.81x = 15,120,786,340.16
  5. Step 5: Solve for x
    x = 15,120,786,340.16/139,161.81
  6. Step 6: Final answer
    x = 108,656.15

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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.