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Finding the Third Proportional to 15,286 and 21,808

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Solution

The third proportional to 15,286 and 21,808 is: 31,112.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,286 : 21,808 = 21,808 : x
  2. Step 2: Convert to fraction form
    15,286/21,808 = 21,808/x
  3. Step 3: Cross multiply
    15,286x = 21,808 × 21,808
  4. Step 4: Simplify right side
    15,286x = 475,588,864
  5. Step 5: Solve for x
    x = 475,588,864/15,286
  6. Step 6: Final answer
    x = 31,112.71

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Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.