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Finding the Fourth Proportional to 217.12, 325.52 and 131.68

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Solution

The fourth proportional to 217.12, 325.52 and 131.68 is: 197.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.12 : 325.52 = 131.68 : x
  2. Step 2: Convert to fraction form
    217.12/325.52 = 131.68/x
  3. Step 3: Cross multiply
    217.12x = 325.52 × 131.68
  4. Step 4: Simplify right side
    217.12x = 42,864.47
  5. Step 5: Solve for x
    x = 42,864.47/217.12
  6. Step 6: Final answer
    x = 197.42

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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.