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Finding the Fourth Proportional to 422.99, 633.48 and 408.39

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Solution

The fourth proportional to 422.99, 633.48 and 408.39 is: 611.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.99 : 633.48 = 408.39 : x
  2. Step 2: Convert to fraction form
    422.99/633.48 = 408.39/x
  3. Step 3: Cross multiply
    422.99x = 633.48 × 408.39
  4. Step 4: Simplify right side
    422.99x = 258,706.90
  5. Step 5: Solve for x
    x = 258,706.90/422.99
  6. Step 6: Final answer
    x = 611.62

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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.