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Finding the Fourth Proportional to 231.44, 346.90 and 218.62

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Solution

The fourth proportional to 231.44, 346.90 and 218.62 is: 327.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.44 : 346.90 = 218.62 : x
  2. Step 2: Convert to fraction form
    231.44/346.90 = 218.62/x
  3. Step 3: Cross multiply
    231.44x = 346.90 × 218.62
  4. Step 4: Simplify right side
    231.44x = 75,839.28
  5. Step 5: Solve for x
    x = 75,839.28/231.44
  6. Step 6: Final answer
    x = 327.68

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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.