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Finding the Fourth Proportional to 285.85, 394.03 and 239.38

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Solution

The fourth proportional to 285.85, 394.03 and 239.38 is: 329.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    285.85 : 394.03 = 239.38 : x
  2. Step 2: Convert to fraction form
    285.85/394.03 = 239.38/x
  3. Step 3: Cross multiply
    285.85x = 394.03 × 239.38
  4. Step 4: Simplify right side
    285.85x = 94,322.22
  5. Step 5: Solve for x
    x = 94,322.22/285.85
  6. Step 6: Final answer
    x = 329.97

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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.