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Finding the Third Proportional to 3,989.25 and 8,178.75

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Solution

The third proportional to 3,989.25 and 8,178.75 is: 16,768.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.25 : 8,178.75 = 8,178.75 : x
  2. Step 2: Convert to fraction form
    3,989.25/8,178.75 = 8,178.75/x
  3. Step 3: Cross multiply
    3,989.25x = 8,178.75 × 8,178.75
  4. Step 4: Simplify right side
    3,989.25x = 66,891,951.56
  5. Step 5: Solve for x
    x = 66,891,951.56/3,989.25
  6. Step 6: Final answer
    x = 16,768.05

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Why These Related Problems?

These problems maintain the same ratio (2.05) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.