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Finding the Fourth Proportional to 379.45, 523.64 and 239.81

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Solution

The fourth proportional to 379.45, 523.64 and 239.81 is: 330.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.45 : 523.64 = 239.81 : x
  2. Step 2: Convert to fraction form
    379.45/523.64 = 239.81/x
  3. Step 3: Cross multiply
    379.45x = 523.64 × 239.81
  4. Step 4: Simplify right side
    379.45x = 125,572.91
  5. Step 5: Solve for x
    x = 125,572.91/379.45
  6. Step 6: Final answer
    x = 330.94

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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.