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Finding the Fourth Proportional to 306.72, 422.82 and 223.92

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Solution

The fourth proportional to 306.72, 422.82 and 223.92 is: 308.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.72 : 422.82 = 223.92 : x
  2. Step 2: Convert to fraction form
    306.72/422.82 = 223.92/x
  3. Step 3: Cross multiply
    306.72x = 422.82 × 223.92
  4. Step 4: Simplify right side
    306.72x = 94,677.85
  5. Step 5: Solve for x
    x = 94,677.85/306.72
  6. Step 6: Final answer
    x = 308.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.