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Finding the Fourth Proportional to 326.80, 487.32 and 281.44

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Solution

The fourth proportional to 326.80, 487.32 and 281.44 is: 419.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    326.80 : 487.32 = 281.44 : x
  2. Step 2: Convert to fraction form
    326.80/487.32 = 281.44/x
  3. Step 3: Cross multiply
    326.80x = 487.32 × 281.44
  4. Step 4: Simplify right side
    326.80x = 137,151.69
  5. Step 5: Solve for x
    x = 137,151.69/326.80
  6. Step 6: Final answer
    x = 419.68

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.