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Finding the Third Proportional to 9,980 and 11,120

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Solution

The third proportional to 9,980 and 11,120 is: 12,390.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,980 : 11,120 = 11,120 : x
  2. Step 2: Convert to fraction form
    9,980/11,120 = 11,120/x
  3. Step 3: Cross multiply
    9,980x = 11,120 × 11,120
  4. Step 4: Simplify right side
    9,980x = 123,654,400
  5. Step 5: Solve for x
    x = 123,654,400/9,980
  6. Step 6: Final answer
    x = 12,390.22

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Why These Related Problems?

These problems maintain the same ratio (1.11) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.