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Finding the Third Proportional to 8,728 and 18,859

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Solution

The third proportional to 8,728 and 18,859 is: 40,749.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,728 : 18,859 = 18,859 : x
  2. Step 2: Convert to fraction form
    8,728/18,859 = 18,859/x
  3. Step 3: Cross multiply
    8,728x = 18,859 × 18,859
  4. Step 4: Simplify right side
    8,728x = 355,661,881
  5. Step 5: Solve for x
    x = 355,661,881/8,728
  6. Step 6: Final answer
    x = 40,749.53

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Why These Related Problems?

These problems maintain the same ratio (2.16) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.