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Finding the Fourth Proportional to 379.28, 523.41 and 231.90

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Solution

The fourth proportional to 379.28, 523.41 and 231.90 is: 320.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    379.28 : 523.41 = 231.90 : x
  2. Step 2: Convert to fraction form
    379.28/523.41 = 231.90/x
  3. Step 3: Cross multiply
    379.28x = 523.41 × 231.90
  4. Step 4: Simplify right side
    379.28x = 121,378.78
  5. Step 5: Solve for x
    x = 121,378.78/379.28
  6. Step 6: Final answer
    x = 320.02

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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.