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Finding the Fourth Proportional to 139,346.70, 192,291.99 and 78,917.78

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Solution

The fourth proportional to 139,346.70, 192,291.99 and 78,917.78 is: 108,902.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,346.70 : 192,291.99 = 78,917.78 : x
  2. Step 2: Convert to fraction form
    139,346.70/192,291.99 = 78,917.78/x
  3. Step 3: Cross multiply
    139,346.70x = 192,291.99 × 78,917.78
  4. Step 4: Simplify right side
    139,346.70x = 15,175,256,001.12
  5. Step 5: Solve for x
    x = 15,175,256,001.12/139,346.70
  6. Step 6: Final answer
    x = 108,902.87

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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.