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Finding the Third Proportional to 3,972.75 and 8,742

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Solution

The third proportional to 3,972.75 and 8,742 is: 19,236.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,972.75 : 8,742 = 8,742 : x
  2. Step 2: Convert to fraction form
    3,972.75/8,742 = 8,742/x
  3. Step 3: Cross multiply
    3,972.75x = 8,742 × 8,742
  4. Step 4: Simplify right side
    3,972.75x = 76,422,564
  5. Step 5: Solve for x
    x = 76,422,564/3,972.75
  6. Step 6: Final answer
    x = 19,236.69

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.