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Finding the Third Proportional to 3,555 and 3,987

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Solution

The third proportional to 3,555 and 3,987 is: 4,471.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,555 : 3,987 = 3,987 : x
  2. Step 2: Convert to fraction form
    3,555/3,987 = 3,987/x
  3. Step 3: Cross multiply
    3,555x = 3,987 × 3,987
  4. Step 4: Simplify right side
    3,555x = 15,896,169
  5. Step 5: Solve for x
    x = 15,896,169/3,555
  6. Step 6: Final answer
    x = 4,471.50

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Why These Related Problems?

These problems maintain the same ratio (1.12) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.