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Finding the Third Proportional to 8,786 and 18,915

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Solution

The third proportional to 8,786 and 18,915 is: 40,721.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,786 : 18,915 = 18,915 : x
  2. Step 2: Convert to fraction form
    8,786/18,915 = 18,915/x
  3. Step 3: Cross multiply
    8,786x = 18,915 × 18,915
  4. Step 4: Simplify right side
    8,786x = 357,777,225
  5. Step 5: Solve for x
    x = 357,777,225/8,786
  6. Step 6: Final answer
    x = 40,721.29

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Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.