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Finding the Third Proportional to 7.13 and 9.91

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Solution

The third proportional to 7.13 and 9.91 is: 13.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.13 : 9.91 = 9.91 : x
  2. Step 2: Convert to fraction form
    7.13/9.91 = 9.91/x
  3. Step 3: Cross multiply
    7.13x = 9.91 × 9.91
  4. Step 4: Simplify right side
    7.13x = 98.13
  5. Step 5: Solve for x
    x = 98.13/7.13
  6. Step 6: Final answer
    x = 13.77

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.