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Finding the Third Proportional to 231.61 and 311.34

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Solution

The third proportional to 231.61 and 311.34 is: 418.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.61 : 311.34 = 311.34 : x
  2. Step 2: Convert to fraction form
    231.61/311.34 = 311.34/x
  3. Step 3: Cross multiply
    231.61x = 311.34 × 311.34
  4. Step 4: Simplify right side
    231.61x = 96,934.93
  5. Step 5: Solve for x
    x = 96,934.93/231.61
  6. Step 6: Final answer
    x = 418.53

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Why These Related Problems?

These problems maintain the same ratio (1.34) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.