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Finding the Third Proportional to 86.91 and 191.11

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Solution

The third proportional to 86.91 and 191.11 is: 420.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    86.91 : 191.11 = 191.11 : x
  2. Step 2: Convert to fraction form
    86.91/191.11 = 191.11/x
  3. Step 3: Cross multiply
    86.91x = 191.11 × 191.11
  4. Step 4: Simplify right side
    86.91x = 36,522.79
  5. Step 5: Solve for x
    x = 36,522.79/86.91
  6. Step 6: Final answer
    x = 420.26

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Why These Related Problems?

These problems maintain the same ratio (2.20) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.