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Finding the Third Proportional to 13,872 and 18,120

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Solution

The third proportional to 13,872 and 18,120 is: 23,668.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,872 : 18,120 = 18,120 : x
  2. Step 2: Convert to fraction form
    13,872/18,120 = 18,120/x
  3. Step 3: Cross multiply
    13,872x = 18,120 × 18,120
  4. Step 4: Simplify right side
    13,872x = 328,334,400
  5. Step 5: Solve for x
    x = 328,334,400/13,872
  6. Step 6: Final answer
    x = 23,668.86

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.