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Finding the Fourth Proportional to 206,520.60, 309,704.10 and 81,835.80

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Solution

The fourth proportional to 206,520.60, 309,704.10 and 81,835.80 is: 122,723.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,520.60 : 309,704.10 = 81,835.80 : x
  2. Step 2: Convert to fraction form
    206,520.60/309,704.10 = 81,835.80/x
  3. Step 3: Cross multiply
    206,520.60x = 309,704.10 × 81,835.80
  4. Step 4: Simplify right side
    206,520.60x = 25,344,882,786.78
  5. Step 5: Solve for x
    x = 25,344,882,786.78/206,520.60
  6. Step 6: Final answer
    x = 122,723.27

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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.