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Finding the Fourth Proportional to 213.55, 319.81 and 121.97

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Solution

The fourth proportional to 213.55, 319.81 and 121.97 is: 182.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    213.55 : 319.81 = 121.97 : x
  2. Step 2: Convert to fraction form
    213.55/319.81 = 121.97/x
  3. Step 3: Cross multiply
    213.55x = 319.81 × 121.97
  4. Step 4: Simplify right side
    213.55x = 39,007.78
  5. Step 5: Solve for x
    x = 39,007.78/213.55
  6. Step 6: Final answer
    x = 182.66

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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.