Home / 87,814.20-131,721.30-78,137.40

Finding the Fourth Proportional to 87,814.20, 131,721.30 and 78,137.40

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Solution

The fourth proportional to 87,814.20, 131,721.30 and 78,137.40 is: 117,206.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,814.20 : 131,721.30 = 78,137.40 : x
  2. Step 2: Convert to fraction form
    87,814.20/131,721.30 = 78,137.40/x
  3. Step 3: Cross multiply
    87,814.20x = 131,721.30 × 78,137.40
  4. Step 4: Simplify right side
    87,814.20x = 10,292,359,906.62
  5. Step 5: Solve for x
    x = 10,292,359,906.62/87,814.20
  6. Step 6: Final answer
    x = 117,206.10

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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.