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Finding the Fourth Proportional to 217.74, 326.61 and 115.22

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Solution

The fourth proportional to 217.74, 326.61 and 115.22 is: 172.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.74 : 326.61 = 115.22 : x
  2. Step 2: Convert to fraction form
    217.74/326.61 = 115.22/x
  3. Step 3: Cross multiply
    217.74x = 326.61 × 115.22
  4. Step 4: Simplify right side
    217.74x = 37,630.37
  5. Step 5: Solve for x
    x = 37,630.37/217.74
  6. Step 6: Final answer
    x = 172.82

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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.