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Finding the Fourth Proportional to 283.20, 390.57 and 239.15

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Solution

The fourth proportional to 283.20, 390.57 and 239.15 is: 329.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    283.20 : 390.57 = 239.15 : x
  2. Step 2: Convert to fraction form
    283.20/390.57 = 239.15/x
  3. Step 3: Cross multiply
    283.20x = 390.57 × 239.15
  4. Step 4: Simplify right side
    283.20x = 93,406.24
  5. Step 5: Solve for x
    x = 93,406.24/283.20
  6. Step 6: Final answer
    x = 329.83

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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.