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Finding the Fourth Proportional to 447.80, 618.72 and 398.24

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Solution

The fourth proportional to 447.80, 618.72 and 398.24 is: 550.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.80 : 618.72 = 398.24 : x
  2. Step 2: Convert to fraction form
    447.80/618.72 = 398.24/x
  3. Step 3: Cross multiply
    447.80x = 618.72 × 398.24
  4. Step 4: Simplify right side
    447.80x = 246,399.05
  5. Step 5: Solve for x
    x = 246,399.05/447.80
  6. Step 6: Final answer
    x = 550.24

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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.