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Finding the Fourth Proportional to 325.78, 447.84 and 280.75

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Solution

The fourth proportional to 325.78, 447.84 and 280.75 is: 385.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    325.78 : 447.84 = 280.75 : x
  2. Step 2: Convert to fraction form
    325.78/447.84 = 280.75/x
  3. Step 3: Cross multiply
    325.78x = 447.84 × 280.75
  4. Step 4: Simplify right side
    325.78x = 125,727.44
  5. Step 5: Solve for x
    x = 125,727.44/325.78
  6. Step 6: Final answer
    x = 385.93

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.