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Finding the Fourth Proportional to 276.06, 381.47 and 221.25

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Solution

The fourth proportional to 276.06, 381.47 and 221.25 is: 305.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.06 : 381.47 = 221.25 : x
  2. Step 2: Convert to fraction form
    276.06/381.47 = 221.25/x
  3. Step 3: Cross multiply
    276.06x = 381.47 × 221.25
  4. Step 4: Simplify right side
    276.06x = 84,399.13
  5. Step 5: Solve for x
    x = 84,399.13/276.06
  6. Step 6: Final answer
    x = 305.73

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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.