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Finding the Fourth Proportional to 605.92, 908.40 and 422.80

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Solution

The fourth proportional to 605.92, 908.40 and 422.80 is: 633.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    605.92 : 908.40 = 422.80 : x
  2. Step 2: Convert to fraction form
    605.92/908.40 = 422.80/x
  3. Step 3: Cross multiply
    605.92x = 908.40 × 422.80
  4. Step 4: Simplify right side
    605.92x = 384,071.52
  5. Step 5: Solve for x
    x = 384,071.52/605.92
  6. Step 6: Final answer
    x = 633.87

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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.