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Finding the Third Proportional to 21,751 and 28,920

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Solution

The third proportional to 21,751 and 28,920 is: 38,451.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,751 : 28,920 = 28,920 : x
  2. Step 2: Convert to fraction form
    21,751/28,920 = 28,920/x
  3. Step 3: Cross multiply
    21,751x = 28,920 × 28,920
  4. Step 4: Simplify right side
    21,751x = 836,366,400
  5. Step 5: Solve for x
    x = 836,366,400/21,751
  6. Step 6: Final answer
    x = 38,451.86

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Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.