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Finding the Fourth Proportional to 217.57, 326.16 and 121.18

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Solution

The fourth proportional to 217.57, 326.16 and 121.18 is: 181.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.57 : 326.16 = 121.18 : x
  2. Step 2: Convert to fraction form
    217.57/326.16 = 121.18/x
  3. Step 3: Cross multiply
    217.57x = 326.16 × 121.18
  4. Step 4: Simplify right side
    217.57x = 39,524.07
  5. Step 5: Solve for x
    x = 39,524.07/217.57
  6. Step 6: Final answer
    x = 181.66

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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.