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Finding the Fourth Proportional to 217.50, 325.92 and 121.38

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Solution

The fourth proportional to 217.50, 325.92 and 121.38 is: 181.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.50 : 325.92 = 121.38 : x
  2. Step 2: Convert to fraction form
    217.50/325.92 = 121.38/x
  3. Step 3: Cross multiply
    217.50x = 325.92 × 121.38
  4. Step 4: Simplify right side
    217.50x = 39,560.17
  5. Step 5: Solve for x
    x = 39,560.17/217.50
  6. Step 6: Final answer
    x = 181.89

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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.