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Finding the Third Proportional to 15,172 and 20,912

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Solution

The third proportional to 15,172 and 20,912 is: 28,823.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,172 : 20,912 = 20,912 : x
  2. Step 2: Convert to fraction form
    15,172/20,912 = 20,912/x
  3. Step 3: Cross multiply
    15,172x = 20,912 × 20,912
  4. Step 4: Simplify right side
    15,172x = 437,311,744
  5. Step 5: Solve for x
    x = 437,311,744/15,172
  6. Step 6: Final answer
    x = 28,823.61

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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.