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Finding the Third Proportional to 6.72 and 7.91

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Solution

The third proportional to 6.72 and 7.91 is: 9.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.72 : 7.91 = 7.91 : x
  2. Step 2: Convert to fraction form
    6.72/7.91 = 7.91/x
  3. Step 3: Cross multiply
    6.72x = 7.91 × 7.91
  4. Step 4: Simplify right side
    6.72x = 62.58
  5. Step 5: Solve for x
    x = 62.58/6.72
  6. Step 6: Final answer
    x = 9.31

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Why These Related Problems?

These problems maintain the same ratio (1.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.