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Finding the Third Proportional to 15,857.25 and 20,856

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Solution

The third proportional to 15,857.25 and 20,856 is: 27,430.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,857.25 : 20,856 = 20,856 : x
  2. Step 2: Convert to fraction form
    15,857.25/20,856 = 20,856/x
  3. Step 3: Cross multiply
    15,857.25x = 20,856 × 20,856
  4. Step 4: Simplify right side
    15,857.25x = 434,972,736
  5. Step 5: Solve for x
    x = 434,972,736/15,857.25
  6. Step 6: Final answer
    x = 27,430.53

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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.