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Finding the Third Proportional to 7,980 and 11,988

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Solution

The third proportional to 7,980 and 11,988 is: 18,009.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,980 : 11,988 = 11,988 : x
  2. Step 2: Convert to fraction form
    7,980/11,988 = 11,988/x
  3. Step 3: Cross multiply
    7,980x = 11,988 × 11,988
  4. Step 4: Simplify right side
    7,980x = 143,712,144
  5. Step 5: Solve for x
    x = 143,712,144/7,980
  6. Step 6: Final answer
    x = 18,009.04

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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.