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Finding the Fourth Proportional to 217.20, 325.85 and 107.57

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Solution

The fourth proportional to 217.20, 325.85 and 107.57 is: 161.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.20 : 325.85 = 107.57 : x
  2. Step 2: Convert to fraction form
    217.20/325.85 = 107.57/x
  3. Step 3: Cross multiply
    217.20x = 325.85 × 107.57
  4. Step 4: Simplify right side
    217.20x = 35,051.68
  5. Step 5: Solve for x
    x = 35,051.68/217.20
  6. Step 6: Final answer
    x = 161.38

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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.