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Finding the Fourth Proportional to 327.24, 490.71 and 258.57

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Solution

The fourth proportional to 327.24, 490.71 and 258.57 is: 387.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.24 : 490.71 = 258.57 : x
  2. Step 2: Convert to fraction form
    327.24/490.71 = 258.57/x
  3. Step 3: Cross multiply
    327.24x = 490.71 × 258.57
  4. Step 4: Simplify right side
    327.24x = 126,882.88
  5. Step 5: Solve for x
    x = 126,882.88/327.24
  6. Step 6: Final answer
    x = 387.74

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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.