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Finding the Fourth Proportional to 311.22, 429.66 and 213.12

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Solution

The fourth proportional to 311.22, 429.66 and 213.12 is: 294.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    311.22 : 429.66 = 213.12 : x
  2. Step 2: Convert to fraction form
    311.22/429.66 = 213.12/x
  3. Step 3: Cross multiply
    311.22x = 429.66 × 213.12
  4. Step 4: Simplify right side
    311.22x = 91,569.14
  5. Step 5: Solve for x
    x = 91,569.14/311.22
  6. Step 6: Final answer
    x = 294.23

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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.