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Finding the Fourth Proportional to 422.65, 633.40 and 216.78

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Solution

The fourth proportional to 422.65, 633.40 and 216.78 is: 324.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.65 : 633.40 = 216.78 : x
  2. Step 2: Convert to fraction form
    422.65/633.40 = 216.78/x
  3. Step 3: Cross multiply
    422.65x = 633.40 × 216.78
  4. Step 4: Simplify right side
    422.65x = 137,307.37
  5. Step 5: Solve for x
    x = 137,307.37/422.65
  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.