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Finding the Fourth Proportional to 217.11, 323.40 and 212.25

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Solution

The fourth proportional to 217.11, 323.40 and 212.25 is: 316.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.11 : 323.40 = 212.25 : x
  2. Step 2: Convert to fraction form
    217.11/323.40 = 212.25/x
  3. Step 3: Cross multiply
    217.11x = 323.40 × 212.25
  4. Step 4: Simplify right side
    217.11x = 68,641.65
  5. Step 5: Solve for x
    x = 68,641.65/217.11
  6. Step 6: Final answer
    x = 316.16

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.