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Finding the Third Proportional to 128,331 and 199,800

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Solution

The third proportional to 128,331 and 199,800 is: 311,070.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,331 : 199,800 = 199,800 : x
  2. Step 2: Convert to fraction form
    128,331/199,800 = 199,800/x
  3. Step 3: Cross multiply
    128,331x = 199,800 × 199,800
  4. Step 4: Simplify right side
    128,331x = 39,920,040,000
  5. Step 5: Solve for x
    x = 39,920,040,000/128,331
  6. Step 6: Final answer
    x = 311,070.90

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Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.