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Finding the Fourth Proportional to 310.17, 428.31 and 254.82

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Solution

The fourth proportional to 310.17, 428.31 and 254.82 is: 351.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    310.17 : 428.31 = 254.82 : x
  2. Step 2: Convert to fraction form
    310.17/428.31 = 254.82/x
  3. Step 3: Cross multiply
    310.17x = 428.31 × 254.82
  4. Step 4: Simplify right side
    310.17x = 109,141.95
  5. Step 5: Solve for x
    x = 109,141.95/310.17
  6. Step 6: Final answer
    x = 351.88

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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.