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Finding the Fourth Proportional to 378.41, 522.15 and 238.55

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Solution

The fourth proportional to 378.41, 522.15 and 238.55 is: 329.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.41 : 522.15 = 238.55 : x
  2. Step 2: Convert to fraction form
    378.41/522.15 = 238.55/x
  3. Step 3: Cross multiply
    378.41x = 522.15 × 238.55
  4. Step 4: Simplify right side
    378.41x = 124,556.27
  5. Step 5: Solve for x
    x = 124,556.27/378.41
  6. Step 6: Final answer
    x = 329.16

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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.