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Finding the Fourth Proportional to 398.30, 548.41 and 328.13

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Solution

The fourth proportional to 398.30, 548.41 and 328.13 is: 451.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    398.30 : 548.41 = 328.13 : x
  2. Step 2: Convert to fraction form
    398.30/548.41 = 328.13/x
  3. Step 3: Cross multiply
    398.30x = 548.41 × 328.13
  4. Step 4: Simplify right side
    398.30x = 179,949.77
  5. Step 5: Solve for x
    x = 179,949.77/398.30
  6. Step 6: Final answer
    x = 451.79

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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.