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Finding the Fourth Proportional to 447.68, 618.55 and 398.12

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Solution

The fourth proportional to 447.68, 618.55 and 398.12 is: 550.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.68 : 618.55 = 398.12 : x
  2. Step 2: Convert to fraction form
    447.68/618.55 = 398.12/x
  3. Step 3: Cross multiply
    447.68x = 618.55 × 398.12
  4. Step 4: Simplify right side
    447.68x = 246,257.68
  5. Step 5: Solve for x
    x = 246,257.68/447.68
  6. Step 6: Final answer
    x = 550.07

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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.