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Finding the Third Proportional to 13,770 and 21,885

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Solution

The third proportional to 13,770 and 21,885 is: 34,782.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,770 : 21,885 = 21,885 : x
  2. Step 2: Convert to fraction form
    13,770/21,885 = 21,885/x
  3. Step 3: Cross multiply
    13,770x = 21,885 × 21,885
  4. Step 4: Simplify right side
    13,770x = 478,953,225
  5. Step 5: Solve for x
    x = 478,953,225/13,770
  6. Step 6: Final answer
    x = 34,782.37

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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.