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Finding the Fourth Proportional to 422.55, 633.78 and 214.38

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Solution

The fourth proportional to 422.55, 633.78 and 214.38 is: 321.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.55 : 633.78 = 214.38 : x
  2. Step 2: Convert to fraction form
    422.55/633.78 = 214.38/x
  3. Step 3: Cross multiply
    422.55x = 633.78 × 214.38
  4. Step 4: Simplify right side
    422.55x = 135,869.76
  5. Step 5: Solve for x
    x = 135,869.76/422.55
  6. Step 6: Final answer
    x = 321.55

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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.