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Finding the Fourth Proportional to 257.04, 385.08 and 255.12

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Solution

The fourth proportional to 257.04, 385.08 and 255.12 is: 382.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    257.04 : 385.08 = 255.12 : x
  2. Step 2: Convert to fraction form
    257.04/385.08 = 255.12/x
  3. Step 3: Cross multiply
    257.04x = 385.08 × 255.12
  4. Step 4: Simplify right side
    257.04x = 98,241.61
  5. Step 5: Solve for x
    x = 98,241.61/257.04
  6. Step 6: Final answer
    x = 382.20

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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.