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Finding the Fourth Proportional to 326.74, 490.17 and 280.96

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Solution

The fourth proportional to 326.74, 490.17 and 280.96 is: 421.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.74 : 490.17 = 280.96 : x
  2. Step 2: Convert to fraction form
    326.74/490.17 = 280.96/x
  3. Step 3: Cross multiply
    326.74x = 490.17 × 280.96
  4. Step 4: Simplify right side
    326.74x = 137,718.16
  5. Step 5: Solve for x
    x = 137,718.16/326.74
  6. Step 6: Final answer
    x = 421.49

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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.