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Finding the Third Proportional to 8,620 and 11,631

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Solution

The third proportional to 8,620 and 11,631 is: 15,693.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620 : 11,631 = 11,631 : x
  2. Step 2: Convert to fraction form
    8,620/11,631 = 11,631/x
  3. Step 3: Cross multiply
    8,620x = 11,631 × 11,631
  4. Step 4: Simplify right side
    8,620x = 135,280,161
  5. Step 5: Solve for x
    x = 135,280,161/8,620
  6. Step 6: Final answer
    x = 15,693.75

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Why These Related Problems?

These problems maintain the same ratio (1.35) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.