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Finding the Third Proportional to 18,018 and 19,638

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Solution

The third proportional to 18,018 and 19,638 is: 21,403.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,018 : 19,638 = 19,638 : x
  2. Step 2: Convert to fraction form
    18,018/19,638 = 19,638/x
  3. Step 3: Cross multiply
    18,018x = 19,638 × 19,638
  4. Step 4: Simplify right side
    18,018x = 385,651,044
  5. Step 5: Solve for x
    x = 385,651,044/18,018
  6. Step 6: Final answer
    x = 21,403.65

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.