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Finding the Fourth Proportional to 422.09, 632.78 and 216.71

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Solution

The fourth proportional to 422.09, 632.78 and 216.71 is: 324.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.09 : 632.78 = 216.71 : x
  2. Step 2: Convert to fraction form
    422.09/632.78 = 216.71/x
  3. Step 3: Cross multiply
    422.09x = 632.78 × 216.71
  4. Step 4: Simplify right side
    422.09x = 137,125.51
  5. Step 5: Solve for x
    x = 137,125.51/422.09
  6. Step 6: Final answer
    x = 324.88

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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.