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Finding the Third Proportional to 13,581 and 21,609

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Solution

The third proportional to 13,581 and 21,609 is: 34,382.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,581 : 21,609 = 21,609 : x
  2. Step 2: Convert to fraction form
    13,581/21,609 = 21,609/x
  3. Step 3: Cross multiply
    13,581x = 21,609 × 21,609
  4. Step 4: Simplify right side
    13,581x = 466,948,881
  5. Step 5: Solve for x
    x = 466,948,881/13,581
  6. Step 6: Final answer
    x = 34,382.51

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Why These Related Problems?

These problems maintain the same ratio (1.59) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.