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Finding the Fourth Proportional to 378.99, 523.17 and 239.22

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Solution

The fourth proportional to 378.99, 523.17 and 239.22 is: 330.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    378.99 : 523.17 = 239.22 : x
  2. Step 2: Convert to fraction form
    378.99/523.17 = 239.22/x
  3. Step 3: Cross multiply
    378.99x = 523.17 × 239.22
  4. Step 4: Simplify right side
    378.99x = 125,152.73
  5. Step 5: Solve for x
    x = 125,152.73/378.99
  6. Step 6: Final answer
    x = 330.23

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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.