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Finding the Fourth Proportional to 386.28, 533.16 and 255.78

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Solution

The fourth proportional to 386.28, 533.16 and 255.78 is: 353.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.28 : 533.16 = 255.78 : x
  2. Step 2: Convert to fraction form
    386.28/533.16 = 255.78/x
  3. Step 3: Cross multiply
    386.28x = 533.16 × 255.78
  4. Step 4: Simplify right side
    386.28x = 136,371.66
  5. Step 5: Solve for x
    x = 136,371.66/386.28
  6. Step 6: Final answer
    x = 353.04

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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.