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Finding the Fourth Proportional to 447.98, 618.28 and 290.39

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Solution

The fourth proportional to 447.98, 618.28 and 290.39 is: 400.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.98 : 618.28 = 290.39 : x
  2. Step 2: Convert to fraction form
    447.98/618.28 = 290.39/x
  3. Step 3: Cross multiply
    447.98x = 618.28 × 290.39
  4. Step 4: Simplify right side
    447.98x = 179,540.15
  5. Step 5: Solve for x
    x = 179,540.15/447.98
  6. Step 6: Final answer
    x = 400.78

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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.