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Finding the Fourth Proportional to 310.60, 428.94 and 255.88

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Solution

The fourth proportional to 310.60, 428.94 and 255.88 is: 353.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.60 : 428.94 = 255.88 : x
  2. Step 2: Convert to fraction form
    310.60/428.94 = 255.88/x
  3. Step 3: Cross multiply
    310.60x = 428.94 × 255.88
  4. Step 4: Simplify right side
    310.60x = 109,757.17
  5. Step 5: Solve for x
    x = 109,757.17/310.60
  6. Step 6: Final answer
    x = 353.37

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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.