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Finding the Third Proportional to 15,890 and 20,896

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Solution

The third proportional to 15,890 and 20,896 is: 27,479.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,890 : 20,896 = 20,896 : x
  2. Step 2: Convert to fraction form
    15,890/20,896 = 20,896/x
  3. Step 3: Cross multiply
    15,890x = 20,896 × 20,896
  4. Step 4: Simplify right side
    15,890x = 436,642,816
  5. Step 5: Solve for x
    x = 436,642,816/15,890
  6. Step 6: Final answer
    x = 27,479.09

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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.