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Finding the Third Proportional to 7.81 and 16.67

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Solution

The third proportional to 7.81 and 16.67 is: 35.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.81 : 16.67 = 16.67 : x
  2. Step 2: Convert to fraction form
    7.81/16.67 = 16.67/x
  3. Step 3: Cross multiply
    7.81x = 16.67 × 16.67
  4. Step 4: Simplify right side
    7.81x = 277.85
  5. Step 5: Solve for x
    x = 277.85/7.81
  6. Step 6: Final answer
    x = 35.58

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Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.