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Finding the Third Proportional to 3,987 and 6,169.50

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Solution

The third proportional to 3,987 and 6,169.50 is: 9,546.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,987 : 6,169.50 = 6,169.50 : x
  2. Step 2: Convert to fraction form
    3,987/6,169.50 = 6,169.50/x
  3. Step 3: Cross multiply
    3,987x = 6,169.50 × 6,169.50
  4. Step 4: Simplify right side
    3,987x = 38,062,730.25
  5. Step 5: Solve for x
    x = 38,062,730.25/3,987
  6. Step 6: Final answer
    x = 9,546.71

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Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.