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Finding the Third Proportional to 2,987 and 4,890

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Solution

The third proportional to 2,987 and 4,890 is: 8,005.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987 : 4,890 = 4,890 : x
  2. Step 2: Convert to fraction form
    2,987/4,890 = 4,890/x
  3. Step 3: Cross multiply
    2,987x = 4,890 × 4,890
  4. Step 4: Simplify right side
    2,987x = 23,912,100
  5. Step 5: Solve for x
    x = 23,912,100/2,987
  6. Step 6: Final answer
    x = 8,005.39

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Why These Related Problems?

These problems maintain the same ratio (1.64) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.