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Finding the Fourth Proportional to 393.80, 589.28 and 239.76

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Solution

The fourth proportional to 393.80, 589.28 and 239.76 is: 358.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    393.80 : 589.28 = 239.76 : x
  2. Step 2: Convert to fraction form
    393.80/589.28 = 239.76/x
  3. Step 3: Cross multiply
    393.80x = 589.28 × 239.76
  4. Step 4: Simplify right side
    393.80x = 141,284.57
  5. Step 5: Solve for x
    x = 141,284.57/393.80
  6. Step 6: Final answer
    x = 358.78

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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.