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Finding the Fourth Proportional to 217.85, 326.93 and 126.42

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Solution

The fourth proportional to 217.85, 326.93 and 126.42 is: 189.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.85 : 326.93 = 126.42 : x
  2. Step 2: Convert to fraction form
    217.85/326.93 = 126.42/x
  3. Step 3: Cross multiply
    217.85x = 326.93 × 126.42
  4. Step 4: Simplify right side
    217.85x = 41,329.86
  5. Step 5: Solve for x
    x = 41,329.86/217.85
  6. Step 6: Final answer
    x = 189.72

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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.