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Finding the Fourth Proportional to 386.87, 533.90 and 255.65

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Solution

The fourth proportional to 386.87, 533.90 and 255.65 is: 352.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.87 : 533.90 = 255.65 : x
  2. Step 2: Convert to fraction form
    386.87/533.90 = 255.65/x
  3. Step 3: Cross multiply
    386.87x = 533.90 × 255.65
  4. Step 4: Simplify right side
    386.87x = 136,487.59
  5. Step 5: Solve for x
    x = 136,487.59/386.87
  6. Step 6: Final answer
    x = 352.80

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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.