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Finding the Fourth Proportional to 331.45, 457.92 and 328.21

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Solution

The fourth proportional to 331.45, 457.92 and 328.21 is: 453.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.45 : 457.92 = 328.21 : x
  2. Step 2: Convert to fraction form
    331.45/457.92 = 328.21/x
  3. Step 3: Cross multiply
    331.45x = 457.92 × 328.21
  4. Step 4: Simplify right side
    331.45x = 150,292.78
  5. Step 5: Solve for x
    x = 150,292.78/331.45
  6. Step 6: Final answer
    x = 453.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.