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Finding the Fourth Proportional to 286.24, 394.81 and 276.72

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Solution

The fourth proportional to 286.24, 394.81 and 276.72 is: 381.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    286.24 : 394.81 = 276.72 : x
  2. Step 2: Convert to fraction form
    286.24/394.81 = 276.72/x
  3. Step 3: Cross multiply
    286.24x = 394.81 × 276.72
  4. Step 4: Simplify right side
    286.24x = 109,251.82
  5. Step 5: Solve for x
    x = 109,251.82/286.24
  6. Step 6: Final answer
    x = 381.68

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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.