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Finding the Fourth Proportional to 231.27, 347.21 and 212.17

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Solution

The fourth proportional to 231.27, 347.21 and 212.17 is: 318.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.27 : 347.21 = 212.17 : x
  2. Step 2: Convert to fraction form
    231.27/347.21 = 212.17/x
  3. Step 3: Cross multiply
    231.27x = 347.21 × 212.17
  4. Step 4: Simplify right side
    231.27x = 73,667.55
  5. Step 5: Solve for x
    x = 73,667.55/231.27
  6. Step 6: Final answer
    x = 318.53

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.