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Finding the Third Proportional to 21,789 and 25,029

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Solution

The third proportional to 21,789 and 25,029 is: 28,750.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,789 : 25,029 = 25,029 : x
  2. Step 2: Convert to fraction form
    21,789/25,029 = 25,029/x
  3. Step 3: Cross multiply
    21,789x = 25,029 × 25,029
  4. Step 4: Simplify right side
    21,789x = 626,450,841
  5. Step 5: Solve for x
    x = 626,450,841/21,789
  6. Step 6: Final answer
    x = 28,750.78

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Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.