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Finding the Fourth Proportional to 206,680.05, 309,958.52 and 80,339.90

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Solution

The fourth proportional to 206,680.05, 309,958.52 and 80,339.90 is: 120,485.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,680.05 : 309,958.52 = 80,339.90 : x
  2. Step 2: Convert to fraction form
    206,680.05/309,958.52 = 80,339.90/x
  3. Step 3: Cross multiply
    206,680.05x = 309,958.52 × 80,339.90
  4. Step 4: Simplify right side
    206,680.05x = 24,902,034,549.46
  5. Step 5: Solve for x
    x = 24,902,034,549.46/206,680.05
  6. Step 6: Final answer
    x = 120,485.91

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1.5x scale

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.