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Finding the Fourth Proportional to 326.88, 490.74 and 205.65

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Solution

The fourth proportional to 326.88, 490.74 and 205.65 is: 308.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.88 : 490.74 = 205.65 : x
  2. Step 2: Convert to fraction form
    326.88/490.74 = 205.65/x
  3. Step 3: Cross multiply
    326.88x = 490.74 × 205.65
  4. Step 4: Simplify right side
    326.88x = 100,920.68
  5. Step 5: Solve for x
    x = 100,920.68/326.88
  6. Step 6: Final answer
    x = 308.74

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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.