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Finding the Fourth Proportional to 307.28, 422.26 and 255.44

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Solution

The fourth proportional to 307.28, 422.26 and 255.44 is: 351.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    307.28 : 422.26 = 255.44 : x
  2. Step 2: Convert to fraction form
    307.28/422.26 = 255.44/x
  3. Step 3: Cross multiply
    307.28x = 422.26 × 255.44
  4. Step 4: Simplify right side
    307.28x = 107,862.09
  5. Step 5: Solve for x
    x = 107,862.09/307.28
  6. Step 6: Final answer
    x = 351.02

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.