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Finding the Third Proportional to 8,872 and 12,980

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Solution

The third proportional to 8,872 and 12,980 is: 18,990.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,872 : 12,980 = 12,980 : x
  2. Step 2: Convert to fraction form
    8,872/12,980 = 12,980/x
  3. Step 3: Cross multiply
    8,872x = 12,980 × 12,980
  4. Step 4: Simplify right side
    8,872x = 168,480,400
  5. Step 5: Solve for x
    x = 168,480,400/8,872
  6. Step 6: Final answer
    x = 18,990.13

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Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.