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Finding the Fourth Proportional to 286.22, 396.64 and 280.75

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Solution

The fourth proportional to 286.22, 396.64 and 280.75 is: 389.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.22 : 396.64 = 280.75 : x
  2. Step 2: Convert to fraction form
    286.22/396.64 = 280.75/x
  3. Step 3: Cross multiply
    286.22x = 396.64 × 280.75
  4. Step 4: Simplify right side
    286.22x = 111,353.29
  5. Step 5: Solve for x
    x = 111,353.29/286.22
  6. Step 6: Final answer
    x = 389.05

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.