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Finding the Fourth Proportional to 276.32, 381.48 and 225.20

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Solution

The fourth proportional to 276.32, 381.48 and 225.20 is: 310.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.32 : 381.48 = 225.20 : x
  2. Step 2: Convert to fraction form
    276.32/381.48 = 225.20/x
  3. Step 3: Cross multiply
    276.32x = 381.48 × 225.20
  4. Step 4: Simplify right side
    276.32x = 85,909.30
  5. Step 5: Solve for x
    x = 85,909.30/276.32
  6. Step 6: Final answer
    x = 310.91

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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.