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Finding the Third Proportional to 15,904 and 21,912

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Solution

The third proportional to 15,904 and 21,912 is: 30,189.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,904 : 21,912 = 21,912 : x
  2. Step 2: Convert to fraction form
    15,904/21,912 = 21,912/x
  3. Step 3: Cross multiply
    15,904x = 21,912 × 21,912
  4. Step 4: Simplify right side
    15,904x = 480,135,744
  5. Step 5: Solve for x
    x = 480,135,744/15,904
  6. Step 6: Final answer
    x = 30,189.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.