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Finding the Fourth Proportional to 255.76, 381.70 and 238.42

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Solution

The fourth proportional to 255.76, 381.70 and 238.42 is: 355.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    255.76 : 381.70 = 238.42 : x
  2. Step 2: Convert to fraction form
    255.76/381.70 = 238.42/x
  3. Step 3: Cross multiply
    255.76x = 381.70 × 238.42
  4. Step 4: Simplify right side
    255.76x = 91,003.01
  5. Step 5: Solve for x
    x = 91,003.01/255.76
  6. Step 6: Final answer
    x = 355.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.