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Finding the Fourth Proportional to 78,958.62, 117,875.88 and 76,190.76

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Solution

The fourth proportional to 78,958.62, 117,875.88 and 76,190.76 is: 113,743.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,958.62 : 117,875.88 = 76,190.76 : x
  2. Step 2: Convert to fraction form
    78,958.62/117,875.88 = 76,190.76/x
  3. Step 3: Cross multiply
    78,958.62x = 117,875.88 × 76,190.76
  4. Step 4: Simplify right side
    78,958.62x = 8,981,052,882.87
  5. Step 5: Solve for x
    x = 8,981,052,882.87/78,958.62
  6. Step 6: Final answer
    x = 113,743.79

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.