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Finding the Fourth Proportional to 87,911.40, 131,780.70 and 78,580.20

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Solution

The fourth proportional to 87,911.40, 131,780.70 and 78,580.20 is: 117,793.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,911.40 : 131,780.70 = 78,580.20 : x
  2. Step 2: Convert to fraction form
    87,911.40/131,780.70 = 78,580.20/x
  3. Step 3: Cross multiply
    87,911.40x = 131,780.70 × 78,580.20
  4. Step 4: Simplify right side
    87,911.40x = 10,355,353,762.14
  5. Step 5: Solve for x
    x = 10,355,353,762.14/87,911.40
  6. Step 6: Final answer
    x = 117,793.07

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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.