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Finding the Fourth Proportional to 217.20, 325.30 and 108.75

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Solution

The fourth proportional to 217.20, 325.30 and 108.75 is: 162.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.20 : 325.30 = 108.75 : x
  2. Step 2: Convert to fraction form
    217.20/325.30 = 108.75/x
  3. Step 3: Cross multiply
    217.20x = 325.30 × 108.75
  4. Step 4: Simplify right side
    217.20x = 35,376.38
  5. Step 5: Solve for x
    x = 35,376.38/217.20
  6. Step 6: Final answer
    x = 162.87

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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.