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Finding the Third Proportional to 11,686.78 and 21,988.97

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Solution

The third proportional to 11,686.78 and 21,988.97 is: 41,372.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    11,686.78 : 21,988.97 = 21,988.97 : x
  2. Step 2: Convert to fraction form
    11,686.78/21,988.97 = 21,988.97/x
  3. Step 3: Cross multiply
    11,686.78x = 21,988.97 × 21,988.97
  4. Step 4: Simplify right side
    11,686.78x = 483,514,746.69
  5. Step 5: Solve for x
    x = 483,514,746.69/11,686.78
  6. Step 6: Final answer
    x = 41,372.79

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Why These Related Problems?

These problems maintain the same ratio (1.88) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.