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Finding the Third Proportional to 6.31 and 9.91

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Solution

The third proportional to 6.31 and 9.91 is: 15.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    6.31 : 9.91 = 9.91 : x
  2. Step 2: Convert to fraction form
    6.31/9.91 = 9.91/x
  3. Step 3: Cross multiply
    6.31x = 9.91 × 9.91
  4. Step 4: Simplify right side
    6.31x = 98.23
  5. Step 5: Solve for x
    x = 98.23/6.31
  6. Step 6: Final answer
    x = 15.57

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Why These Related Problems?

These problems maintain the same ratio (1.57) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.