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Finding the Fourth Proportional to 87,405.80, 131,108.70 and 80,647.40

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Solution

The fourth proportional to 87,405.80, 131,108.70 and 80,647.40 is: 120,971.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,405.80 : 131,108.70 = 80,647.40 : x
  2. Step 2: Convert to fraction form
    87,405.80/131,108.70 = 80,647.40/x
  3. Step 3: Cross multiply
    87,405.80x = 131,108.70 × 80,647.40
  4. Step 4: Simplify right side
    87,405.80x = 10,573,575,772.38
  5. Step 5: Solve for x
    x = 10,573,575,772.38/87,405.80
  6. Step 6: Final answer
    x = 120,971.10

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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.