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Finding the Fourth Proportional to 393, 588.78 and 255.72

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Solution

The fourth proportional to 393, 588.78 and 255.72 is: 383.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    393 : 588.78 = 255.72 : x
  2. Step 2: Convert to fraction form
    393/588.78 = 255.72/x
  3. Step 3: Cross multiply
    393x = 588.78 × 255.72
  4. Step 4: Simplify right side
    393x = 150,562.82
  5. Step 5: Solve for x
    x = 150,562.82/393
  6. Step 6: Final answer
    x = 383.11

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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.