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Finding the Third Proportional to 90.91 and 171.07

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Solution

The third proportional to 90.91 and 171.07 is: 321.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.91 : 171.07 = 171.07 : x
  2. Step 2: Convert to fraction form
    90.91/171.07 = 171.07/x
  3. Step 3: Cross multiply
    90.91x = 171.07 × 171.07
  4. Step 4: Simplify right side
    90.91x = 29,265.05
  5. Step 5: Solve for x
    x = 29,265.05/90.91
  6. Step 6: Final answer
    x = 321.90

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Why These Related Problems?

These problems maintain the same ratio (1.88) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.