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Finding the Fourth Proportional to 379.52, 523.76 and 255.20

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Solution

The fourth proportional to 379.52, 523.76 and 255.20 is: 352.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.52 : 523.76 = 255.20 : x
  2. Step 2: Convert to fraction form
    379.52/523.76 = 255.20/x
  3. Step 3: Cross multiply
    379.52x = 523.76 × 255.20
  4. Step 4: Simplify right side
    379.52x = 133,663.55
  5. Step 5: Solve for x
    x = 133,663.55/379.52
  6. Step 6: Final answer
    x = 352.19

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.