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Finding the Third Proportional to 3.56 and 8.31

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Solution

The third proportional to 3.56 and 8.31 is: 19.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3.56 : 8.31 = 8.31 : x
  2. Step 2: Convert to fraction form
    3.56/8.31 = 8.31/x
  3. Step 3: Cross multiply
    3.56x = 8.31 × 8.31
  4. Step 4: Simplify right side
    3.56x = 69.12
  5. Step 5: Solve for x
    x = 69.12/3.56
  6. Step 6: Final answer
    x = 19.40

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Why These Related Problems?

These problems maintain the same ratio (2.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.