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Finding the Third Proportional to 91.13 and 99.67

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Solution

The third proportional to 91.13 and 99.67 is: 109.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.13 : 99.67 = 99.67 : x
  2. Step 2: Convert to fraction form
    91.13/99.67 = 99.67/x
  3. Step 3: Cross multiply
    91.13x = 99.67 × 99.67
  4. Step 4: Simplify right side
    91.13x = 9,933.70
  5. Step 5: Solve for x
    x = 9,933.70/91.13
  6. Step 6: Final answer
    x = 109.01

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Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.