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Finding the Fourth Proportional to 386.28, 533.50 and 255.86

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Solution

The fourth proportional to 386.28, 533.50 and 255.86 is: 353.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.28 : 533.50 = 255.86 : x
  2. Step 2: Convert to fraction form
    386.28/533.50 = 255.86/x
  3. Step 3: Cross multiply
    386.28x = 533.50 × 255.86
  4. Step 4: Simplify right side
    386.28x = 136,501.31
  5. Step 5: Solve for x
    x = 136,501.31/386.28
  6. Step 6: Final answer
    x = 353.37

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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.