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Finding the Third Proportional to 20,790 and 31,209

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Solution

The third proportional to 20,790 and 31,209 is: 46,849.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,790 : 31,209 = 31,209 : x
  2. Step 2: Convert to fraction form
    20,790/31,209 = 31,209/x
  3. Step 3: Cross multiply
    20,790x = 31,209 × 31,209
  4. Step 4: Simplify right side
    20,790x = 974,001,681
  5. Step 5: Solve for x
    x = 974,001,681/20,790
  6. Step 6: Final answer
    x = 46,849.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.