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Finding the Fourth Proportional to 393.99, 590.19 and 239.46

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Solution

The fourth proportional to 393.99, 590.19 and 239.46 is: 358.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.99 : 590.19 = 239.46 : x
  2. Step 2: Convert to fraction form
    393.99/590.19 = 239.46/x
  3. Step 3: Cross multiply
    393.99x = 590.19 × 239.46
  4. Step 4: Simplify right side
    393.99x = 141,326.90
  5. Step 5: Solve for x
    x = 141,326.90/393.99
  6. Step 6: Final answer
    x = 358.71

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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.