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Finding the Fourth Proportional to 392.70, 588.64 and 255.81

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Solution

The fourth proportional to 392.70, 588.64 and 255.81 is: 383.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    392.70 : 588.64 = 255.81 : x
  2. Step 2: Convert to fraction form
    392.70/588.64 = 255.81/x
  3. Step 3: Cross multiply
    392.70x = 588.64 × 255.81
  4. Step 4: Simplify right side
    392.70x = 150,578.72
  5. Step 5: Solve for x
    x = 150,578.72/392.70
  6. Step 6: Final answer
    x = 383.44

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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.