Home / 87,678.56-131,517.84-81,380

Finding the Fourth Proportional to 87,678.56, 131,517.84 and 81,380

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Solution

The fourth proportional to 87,678.56, 131,517.84 and 81,380 is: 122,070.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,678.56 : 131,517.84 = 81,380 : x
  2. Step 2: Convert to fraction form
    87,678.56/131,517.84 = 81,380/x
  3. Step 3: Cross multiply
    87,678.56x = 131,517.84 × 81,380
  4. Step 4: Simplify right side
    87,678.56x = 10,702,921,819.20
  5. Step 5: Solve for x
    x = 10,702,921,819.20/87,678.56
  6. Step 6: Final answer
    x = 122,070.00

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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.