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Finding the Third Proportional to 13,545 and 21,811

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Solution

The third proportional to 13,545 and 21,811 is: 35,121.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,545 : 21,811 = 21,811 : x
  2. Step 2: Convert to fraction form
    13,545/21,811 = 21,811/x
  3. Step 3: Cross multiply
    13,545x = 21,811 × 21,811
  4. Step 4: Simplify right side
    13,545x = 475,719,721
  5. Step 5: Solve for x
    x = 475,719,721/13,545
  6. Step 6: Final answer
    x = 35,121.43

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Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.