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Finding the Fourth Proportional to 306.13, 422.30 and 218.85

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Solution

The fourth proportional to 306.13, 422.30 and 218.85 is: 301.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.13 : 422.30 = 218.85 : x
  2. Step 2: Convert to fraction form
    306.13/422.30 = 218.85/x
  3. Step 3: Cross multiply
    306.13x = 422.30 × 218.85
  4. Step 4: Simplify right side
    306.13x = 92,420.46
  5. Step 5: Solve for x
    x = 92,420.46/306.13
  6. Step 6: Final answer
    x = 301.90

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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.