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Finding the Third Proportional to 3,945 and 8,688

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Solution

The third proportional to 3,945 and 8,688 is: 19,133.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,945 : 8,688 = 8,688 : x
  2. Step 2: Convert to fraction form
    3,945/8,688 = 8,688/x
  3. Step 3: Cross multiply
    3,945x = 8,688 × 8,688
  4. Step 4: Simplify right side
    3,945x = 75,481,344
  5. Step 5: Solve for x
    x = 75,481,344/3,945
  6. Step 6: Final answer
    x = 19,133.42

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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.