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Finding the Fourth Proportional to 447.80, 618.08 and 261.36

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Solution

The fourth proportional to 447.80, 618.08 and 261.36 is: 360.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.80 : 618.08 = 261.36 : x
  2. Step 2: Convert to fraction form
    447.80/618.08 = 261.36/x
  3. Step 3: Cross multiply
    447.80x = 618.08 × 261.36
  4. Step 4: Simplify right side
    447.80x = 161,540.08
  5. Step 5: Solve for x
    x = 161,540.08/447.80
  6. Step 6: Final answer
    x = 360.75

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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.