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Finding the Fourth Proportional to 306.46, 422.69 and 213.21

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Solution

The fourth proportional to 306.46, 422.69 and 213.21 is: 294.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    306.46 : 422.69 = 213.21 : x
  2. Step 2: Convert to fraction form
    306.46/422.69 = 213.21/x
  3. Step 3: Cross multiply
    306.46x = 422.69 × 213.21
  4. Step 4: Simplify right side
    306.46x = 90,120.67
  5. Step 5: Solve for x
    x = 90,120.67/306.46
  6. Step 6: Final answer
    x = 294.07

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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.