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Finding the Third Proportional to 20,489 and 31,329

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Solution

The third proportional to 20,489 and 31,329 is: 47,904.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,489 : 31,329 = 31,329 : x
  2. Step 2: Convert to fraction form
    20,489/31,329 = 31,329/x
  3. Step 3: Cross multiply
    20,489x = 31,329 × 31,329
  4. Step 4: Simplify right side
    20,489x = 981,506,241
  5. Step 5: Solve for x
    x = 981,506,241/20,489
  6. Step 6: Final answer
    x = 47,904.06

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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.