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Finding the Third Proportional to 17,478 and 18,918

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Solution

The third proportional to 17,478 and 18,918 is: 20,476.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,478 : 18,918 = 18,918 : x
  2. Step 2: Convert to fraction form
    17,478/18,918 = 18,918/x
  3. Step 3: Cross multiply
    17,478x = 18,918 × 18,918
  4. Step 4: Simplify right side
    17,478x = 357,890,724
  5. Step 5: Solve for x
    x = 357,890,724/17,478
  6. Step 6: Final answer
    x = 20,476.64

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.