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Finding the Fourth Proportional to 392.45, 587.81 and 255.08

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Solution

The fourth proportional to 392.45, 587.81 and 255.08 is: 382.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.45 : 587.81 = 255.08 : x
  2. Step 2: Convert to fraction form
    392.45/587.81 = 255.08/x
  3. Step 3: Cross multiply
    392.45x = 587.81 × 255.08
  4. Step 4: Simplify right side
    392.45x = 149,940.68
  5. Step 5: Solve for x
    x = 149,940.68/392.45
  6. Step 6: Final answer
    x = 382.07

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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.