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Finding the Third Proportional to 8,620 and 12,918

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Solution

The third proportional to 8,620 and 12,918 is: 19,359.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,620 : 12,918 = 12,918 : x
  2. Step 2: Convert to fraction form
    8,620/12,918 = 12,918/x
  3. Step 3: Cross multiply
    8,620x = 12,918 × 12,918
  4. Step 4: Simplify right side
    8,620x = 166,874,724
  5. Step 5: Solve for x
    x = 166,874,724/8,620
  6. Step 6: Final answer
    x = 19,359.02

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.