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Finding the Third Proportional to 161.72 and 381.66

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Solution

The third proportional to 161.72 and 381.66 is: 900.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.72 : 381.66 = 381.66 : x
  2. Step 2: Convert to fraction form
    161.72/381.66 = 381.66/x
  3. Step 3: Cross multiply
    161.72x = 381.66 × 381.66
  4. Step 4: Simplify right side
    161.72x = 145,661.49
  5. Step 5: Solve for x
    x = 145,661.49/161.72
  6. Step 6: Final answer
    x = 900.71

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Why These Related Problems?

These problems maintain the same ratio (2.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.