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Finding the Third Proportional to 8,672 and 20,720

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Solution

The third proportional to 8,672 and 20,720 is: 49,506.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,672 : 20,720 = 20,720 : x
  2. Step 2: Convert to fraction form
    8,672/20,720 = 20,720/x
  3. Step 3: Cross multiply
    8,672x = 20,720 × 20,720
  4. Step 4: Simplify right side
    8,672x = 429,318,400
  5. Step 5: Solve for x
    x = 429,318,400/8,672
  6. Step 6: Final answer
    x = 49,506.27

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Why These Related Problems?

These problems maintain the same ratio (2.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.