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Finding the Third Proportional to 12,920 and 18,918

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Solution

The third proportional to 12,920 and 18,918 is: 27,700.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,920 : 18,918 = 18,918 : x
  2. Step 2: Convert to fraction form
    12,920/18,918 = 18,918/x
  3. Step 3: Cross multiply
    12,920x = 18,918 × 18,918
  4. Step 4: Simplify right side
    12,920x = 357,890,724
  5. Step 5: Solve for x
    x = 357,890,724/12,920
  6. Step 6: Final answer
    x = 27,700.52

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.