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Finding the Fourth Proportional to 276.24, 381.72 and 239.28

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Solution

The fourth proportional to 276.24, 381.72 and 239.28 is: 330.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.24 : 381.72 = 239.28 : x
  2. Step 2: Convert to fraction form
    276.24/381.72 = 239.28/x
  3. Step 3: Cross multiply
    276.24x = 381.72 × 239.28
  4. Step 4: Simplify right side
    276.24x = 91,337.96
  5. Step 5: Solve for x
    x = 91,337.96/276.24
  6. Step 6: Final answer
    x = 330.65

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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.