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Finding the Third Proportional to 11,120 and 15,640

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Solution

The third proportional to 11,120 and 15,640 is: 21,997.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,120 : 15,640 = 15,640 : x
  2. Step 2: Convert to fraction form
    11,120/15,640 = 15,640/x
  3. Step 3: Cross multiply
    11,120x = 15,640 × 15,640
  4. Step 4: Simplify right side
    11,120x = 244,609,600
  5. Step 5: Solve for x
    x = 244,609,600/11,120
  6. Step 6: Final answer
    x = 21,997.27

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Why These Related Problems?

These problems maintain the same ratio (1.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.