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Finding the Fourth Proportional to 217.69, 326.54 and 69.42

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Solution

The fourth proportional to 217.69, 326.54 and 69.42 is: 104.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.69 : 326.54 = 69.42 : x
  2. Step 2: Convert to fraction form
    217.69/326.54 = 69.42/x
  3. Step 3: Cross multiply
    217.69x = 326.54 × 69.42
  4. Step 4: Simplify right side
    217.69x = 22,668.41
  5. Step 5: Solve for x
    x = 22,668.41/217.69
  6. Step 6: Final answer
    x = 104.13

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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.