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Finding the Third Proportional to 13,619 and 21,400

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Solution

The third proportional to 13,619 and 21,400 is: 33,626.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,619 : 21,400 = 21,400 : x
  2. Step 2: Convert to fraction form
    13,619/21,400 = 21,400/x
  3. Step 3: Cross multiply
    13,619x = 21,400 × 21,400
  4. Step 4: Simplify right side
    13,619x = 457,960,000
  5. Step 5: Solve for x
    x = 457,960,000/13,619
  6. Step 6: Final answer
    x = 33,626.55

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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.