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Finding the Fourth Proportional to 87,316.80, 131,320.80 and 78,331.20

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Solution

The fourth proportional to 87,316.80, 131,320.80 and 78,331.20 is: 117,806.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,316.80 : 131,320.80 = 78,331.20 : x
  2. Step 2: Convert to fraction form
    87,316.80/131,320.80 = 78,331.20/x
  3. Step 3: Cross multiply
    87,316.80x = 131,320.80 × 78,331.20
  4. Step 4: Simplify right side
    87,316.80x = 10,286,515,848.96
  5. Step 5: Solve for x
    x = 10,286,515,848.96/87,316.80
  6. Step 6: Final answer
    x = 117,806.83

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.