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Finding the Third Proportional to 20,487 and 31,326

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Solution

The third proportional to 20,487 and 31,326 is: 47,899.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,487 : 31,326 = 31,326 : x
  2. Step 2: Convert to fraction form
    20,487/31,326 = 31,326/x
  3. Step 3: Cross multiply
    20,487x = 31,326 × 31,326
  4. Step 4: Simplify right side
    20,487x = 981,318,276
  5. Step 5: Solve for x
    x = 981,318,276/20,487
  6. Step 6: Final answer
    x = 47,899.56

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Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.