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Finding the Fourth Proportional to 326.76, 490.25 and 131.85

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Solution

The fourth proportional to 326.76, 490.25 and 131.85 is: 197.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.76 : 490.25 = 131.85 : x
  2. Step 2: Convert to fraction form
    326.76/490.25 = 131.85/x
  3. Step 3: Cross multiply
    326.76x = 490.25 × 131.85
  4. Step 4: Simplify right side
    326.76x = 64,638.80
  5. Step 5: Solve for x
    x = 64,638.80/326.76
  6. Step 6: Final answer
    x = 197.82

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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.