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Finding the Fourth Proportional to 217.99, 326.46 and 212.51

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Solution

The fourth proportional to 217.99, 326.46 and 212.51 is: 318.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    217.99 : 326.46 = 212.51 : x
  2. Step 2: Convert to fraction form
    217.99/326.46 = 212.51/x
  3. Step 3: Cross multiply
    217.99x = 326.46 × 212.51
  4. Step 4: Simplify right side
    217.99x = 69,376.01
  5. Step 5: Solve for x
    x = 69,376.01/217.99
  6. Step 6: Final answer
    x = 318.25

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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.