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Finding the Third Proportional to 2,987 and 4,178

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Solution

The third proportional to 2,987 and 4,178 is: 5,843.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,987 : 4,178 = 4,178 : x
  2. Step 2: Convert to fraction form
    2,987/4,178 = 4,178/x
  3. Step 3: Cross multiply
    2,987x = 4,178 × 4,178
  4. Step 4: Simplify right side
    2,987x = 17,455,684
  5. Step 5: Solve for x
    x = 17,455,684/2,987
  6. Step 6: Final answer
    x = 5,843.88

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Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.