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Finding the Fourth Proportional to 310.64, 427.61 and 255.29

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Solution

The fourth proportional to 310.64, 427.61 and 255.29 is: 351.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.64 : 427.61 = 255.29 : x
  2. Step 2: Convert to fraction form
    310.64/427.61 = 255.29/x
  3. Step 3: Cross multiply
    310.64x = 427.61 × 255.29
  4. Step 4: Simplify right side
    310.64x = 109,163.06
  5. Step 5: Solve for x
    x = 109,163.06/310.64
  6. Step 6: Final answer
    x = 351.42

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.