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Finding the Fourth Proportional to 395.92, 593.79 and 139.42

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Solution

The fourth proportional to 395.92, 593.79 and 139.42 is: 209.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    395.92 : 593.79 = 139.42 : x
  2. Step 2: Convert to fraction form
    395.92/593.79 = 139.42/x
  3. Step 3: Cross multiply
    395.92x = 593.79 × 139.42
  4. Step 4: Simplify right side
    395.92x = 82,786.20
  5. Step 5: Solve for x
    x = 82,786.20/395.92
  6. Step 6: Final answer
    x = 209.10

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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.