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Finding the Fourth Proportional to 422.66, 634.88 and 408.81

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Solution

The fourth proportional to 422.66, 634.88 and 408.81 is: 614.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    422.66 : 634.88 = 408.81 : x
  2. Step 2: Convert to fraction form
    422.66/634.88 = 408.81/x
  3. Step 3: Cross multiply
    422.66x = 634.88 × 408.81
  4. Step 4: Simplify right side
    422.66x = 259,543.25
  5. Step 5: Solve for x
    x = 259,543.25/422.66
  6. Step 6: Final answer
    x = 614.08

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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.