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Finding the Third Proportional to 13,679 and 21,431

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Solution

The third proportional to 13,679 and 21,431 is: 33,576.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,679 : 21,431 = 21,431 : x
  2. Step 2: Convert to fraction form
    13,679/21,431 = 21,431/x
  3. Step 3: Cross multiply
    13,679x = 21,431 × 21,431
  4. Step 4: Simplify right side
    13,679x = 459,287,761
  5. Step 5: Solve for x
    x = 459,287,761/13,679
  6. Step 6: Final answer
    x = 33,576.12

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.