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Finding the Third Proportional to 15,826 and 21,122

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Solution

The third proportional to 15,826 and 21,122 is: 28,190.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,826 : 21,122 = 21,122 : x
  2. Step 2: Convert to fraction form
    15,826/21,122 = 21,122/x
  3. Step 3: Cross multiply
    15,826x = 21,122 × 21,122
  4. Step 4: Simplify right side
    15,826x = 446,138,884
  5. Step 5: Solve for x
    x = 446,138,884/15,826
  6. Step 6: Final answer
    x = 28,190.25

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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.