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Finding the Fourth Proportional to 217.39, 326.07 and 89.23

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Solution

The fourth proportional to 217.39, 326.07 and 89.23 is: 133.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.39 : 326.07 = 89.23 : x
  2. Step 2: Convert to fraction form
    217.39/326.07 = 89.23/x
  3. Step 3: Cross multiply
    217.39x = 326.07 × 89.23
  4. Step 4: Simplify right side
    217.39x = 29,095.23
  5. Step 5: Solve for x
    x = 29,095.23/217.39
  6. Step 6: Final answer
    x = 133.84

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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.