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Finding the Third Proportional to 80,660 and 128,121

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Solution

The third proportional to 80,660 and 128,121 is: 203,508.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,660 : 128,121 = 128,121 : x
  2. Step 2: Convert to fraction form
    80,660/128,121 = 128,121/x
  3. Step 3: Cross multiply
    80,660x = 128,121 × 128,121
  4. Step 4: Simplify right side
    80,660x = 16,414,990,641
  5. Step 5: Solve for x
    x = 16,414,990,641/80,660
  6. Step 6: Final answer
    x = 203,508.44

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.