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Finding the Fourth Proportional to 139,352.62, 192,308.69 and 78,921.74

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Solution

The fourth proportional to 139,352.62, 192,308.69 and 78,921.74 is: 108,913.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,352.62 : 192,308.69 = 78,921.74 : x
  2. Step 2: Convert to fraction form
    139,352.62/192,308.69 = 78,921.74/x
  3. Step 3: Cross multiply
    139,352.62x = 192,308.69 × 78,921.74
  4. Step 4: Simplify right side
    139,352.62x = 15,177,336,431.92
  5. Step 5: Solve for x
    x = 15,177,336,431.92/139,352.62
  6. Step 6: Final answer
    x = 108,913.18

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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.