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Finding the Third Proportional to 9,120 and 11,988

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Solution

The third proportional to 9,120 and 11,988 is: 15,757.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,120 : 11,988 = 11,988 : x
  2. Step 2: Convert to fraction form
    9,120/11,988 = 11,988/x
  3. Step 3: Cross multiply
    9,120x = 11,988 × 11,988
  4. Step 4: Simplify right side
    9,120x = 143,712,144
  5. Step 5: Solve for x
    x = 143,712,144/9,120
  6. Step 6: Final answer
    x = 15,757.91

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Why These Related Problems?

These problems maintain the same ratio (1.31) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.