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Finding the Third Proportional to 8,640 and 20,655

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Solution

The third proportional to 8,640 and 20,655 is: 49,378.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,640 : 20,655 = 20,655 : x
  2. Step 2: Convert to fraction form
    8,640/20,655 = 20,655/x
  3. Step 3: Cross multiply
    8,640x = 20,655 × 20,655
  4. Step 4: Simplify right side
    8,640x = 426,629,025
  5. Step 5: Solve for x
    x = 426,629,025/8,640
  6. Step 6: Final answer
    x = 49,378.36

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Why These Related Problems?

These problems maintain the same ratio (2.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.