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Finding the Fourth Proportional to 231.69, 347.02 and 217.42

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Solution

The fourth proportional to 231.69, 347.02 and 217.42 is: 325.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.69 : 347.02 = 217.42 : x
  2. Step 2: Convert to fraction form
    231.69/347.02 = 217.42/x
  3. Step 3: Cross multiply
    231.69x = 347.02 × 217.42
  4. Step 4: Simplify right side
    231.69x = 75,447.68
  5. Step 5: Solve for x
    x = 75,447.68/231.69
  6. Step 6: Final answer
    x = 325.64

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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.