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Finding the Third Proportional to 2.18 and 3.87

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Solution

The third proportional to 2.18 and 3.87 is: 6.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.18 : 3.87 = 3.87 : x
  2. Step 2: Convert to fraction form
    2.18/3.87 = 3.87/x
  3. Step 3: Cross multiply
    2.18x = 3.87 × 3.87
  4. Step 4: Simplify right side
    2.18x = 14.96
  5. Step 5: Solve for x
    x = 14.96/2.18
  6. Step 6: Final answer
    x = 6.86

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Why These Related Problems?

These problems maintain the same ratio (1.77) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.