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Finding the Fourth Proportional to 515.71, 773.20 and 255.39

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Solution

The fourth proportional to 515.71, 773.20 and 255.39 is: 382.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.71 : 773.20 = 255.39 : x
  2. Step 2: Convert to fraction form
    515.71/773.20 = 255.39/x
  3. Step 3: Cross multiply
    515.71x = 773.20 × 255.39
  4. Step 4: Simplify right side
    515.71x = 197,467.55
  5. Step 5: Solve for x
    x = 197,467.55/515.71
  6. Step 6: Final answer
    x = 382.90

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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.