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Finding the Third Proportional to 7.72 and 8.31

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Solution

The third proportional to 7.72 and 8.31 is: 8.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.72 : 8.31 = 8.31 : x
  2. Step 2: Convert to fraction form
    7.72/8.31 = 8.31/x
  3. Step 3: Cross multiply
    7.72x = 8.31 × 8.31
  4. Step 4: Simplify right side
    7.72x = 69.12
  5. Step 5: Solve for x
    x = 69.12/7.72
  6. Step 6: Final answer
    x = 8.95

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Why These Related Problems?

These problems maintain the same ratio (1.08) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.