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Finding the Fourth Proportional to 217.58, 326.28 and 149.12

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Solution

The fourth proportional to 217.58, 326.28 and 149.12 is: 223.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.58 : 326.28 = 149.12 : x
  2. Step 2: Convert to fraction form
    217.58/326.28 = 149.12/x
  3. Step 3: Cross multiply
    217.58x = 326.28 × 149.12
  4. Step 4: Simplify right side
    217.58x = 48,654.94
  5. Step 5: Solve for x
    x = 48,654.94/217.58
  6. Step 6: Final answer
    x = 223.62

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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.