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Finding the Fourth Proportional to 306.14, 422.61 and 213.20

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Solution

The fourth proportional to 306.14, 422.61 and 213.20 is: 294.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.14 : 422.61 = 213.20 : x
  2. Step 2: Convert to fraction form
    306.14/422.61 = 213.20/x
  3. Step 3: Cross multiply
    306.14x = 422.61 × 213.20
  4. Step 4: Simplify right side
    306.14x = 90,100.45
  5. Step 5: Solve for x
    x = 90,100.45/306.14
  6. Step 6: Final answer
    x = 294.31

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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.