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Finding the Fourth Proportional to 330.55, 496.10 and 257.25

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Solution

The fourth proportional to 330.55, 496.10 and 257.25 is: 386.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    330.55 : 496.10 = 257.25 : x
  2. Step 2: Convert to fraction form
    330.55/496.10 = 257.25/x
  3. Step 3: Cross multiply
    330.55x = 496.10 × 257.25
  4. Step 4: Simplify right side
    330.55x = 127,621.73
  5. Step 5: Solve for x
    x = 127,621.73/330.55
  6. Step 6: Final answer
    x = 386.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.