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Finding the Third Proportional to 21,008 and 27,720

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Solution

The third proportional to 21,008 and 27,720 is: 36,576.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,008 : 27,720 = 27,720 : x
  2. Step 2: Convert to fraction form
    21,008/27,720 = 27,720/x
  3. Step 3: Cross multiply
    21,008x = 27,720 × 27,720
  4. Step 4: Simplify right side
    21,008x = 768,398,400
  5. Step 5: Solve for x
    x = 768,398,400/21,008
  6. Step 6: Final answer
    x = 36,576.47

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Why These Related Problems?

These problems maintain the same ratio (1.32) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.