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Finding the Fourth Proportional to 447.91, 618.39 and 355.03

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Solution

The fourth proportional to 447.91, 618.39 and 355.03 is: 490.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.91 : 618.39 = 355.03 : x
  2. Step 2: Convert to fraction form
    447.91/618.39 = 355.03/x
  3. Step 3: Cross multiply
    447.91x = 618.39 × 355.03
  4. Step 4: Simplify right side
    447.91x = 219,542.13
  5. Step 5: Solve for x
    x = 219,542.13/447.91
  6. Step 6: Final answer
    x = 490.15

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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.