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Finding the Fourth Proportional to 330.89, 456.17 and 257.31

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Solution

The fourth proportional to 330.89, 456.17 and 257.31 is: 354.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.89 : 456.17 = 257.31 : x
  2. Step 2: Convert to fraction form
    330.89/456.17 = 257.31/x
  3. Step 3: Cross multiply
    330.89x = 456.17 × 257.31
  4. Step 4: Simplify right side
    330.89x = 117,375.82
  5. Step 5: Solve for x
    x = 117,375.82/330.89
  6. Step 6: Final answer
    x = 354.73

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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.