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Finding the Third Proportional to 9.91 and 20.67

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Solution

The third proportional to 9.91 and 20.67 is: 43.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    9.91 : 20.67 = 20.67 : x
  2. Step 2: Convert to fraction form
    9.91/20.67 = 20.67/x
  3. Step 3: Cross multiply
    9.91x = 20.67 × 20.67
  4. Step 4: Simplify right side
    9.91x = 427.33
  5. Step 5: Solve for x
    x = 427.33/9.91
  6. Step 6: Final answer
    x = 43.10

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.