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Finding the Third Proportional to 2.80 and 6.88

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Solution

The third proportional to 2.80 and 6.88 is: 16.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2.80 : 6.88 = 6.88 : x
  2. Step 2: Convert to fraction form
    2.80/6.88 = 6.88/x
  3. Step 3: Cross multiply
    2.80x = 6.88 × 6.88
  4. Step 4: Simplify right side
    2.80x = 47.37
  5. Step 5: Solve for x
    x = 47.37/2.80
  6. Step 6: Final answer
    x = 16.90

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Why These Related Problems?

These problems maintain the same ratio (2.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.