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Finding the Fourth Proportional to 515.75, 773.21 and 255.84

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Solution

The fourth proportional to 515.75, 773.21 and 255.84 is: 383.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    515.75 : 773.21 = 255.84 : x
  2. Step 2: Convert to fraction form
    515.75/773.21 = 255.84/x
  3. Step 3: Cross multiply
    515.75x = 773.21 × 255.84
  4. Step 4: Simplify right side
    515.75x = 197,815.79
  5. Step 5: Solve for x
    x = 197,815.79/515.75
  6. Step 6: Final answer
    x = 383.55

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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.