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Finding the Third Proportional to 13,971.75 and 21,138

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Solution

The third proportional to 13,971.75 and 21,138 is: 31,979.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,971.75 : 21,138 = 21,138 : x
  2. Step 2: Convert to fraction form
    13,971.75/21,138 = 21,138/x
  3. Step 3: Cross multiply
    13,971.75x = 21,138 × 21,138
  4. Step 4: Simplify right side
    13,971.75x = 446,815,044
  5. Step 5: Solve for x
    x = 446,815,044/13,971.75
  6. Step 6: Final answer
    x = 31,979.89

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.