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Finding the Fourth Proportional to 387.28, 533.99 and 276.56

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Solution

The fourth proportional to 387.28, 533.99 and 276.56 is: 381.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    387.28 : 533.99 = 276.56 : x
  2. Step 2: Convert to fraction form
    387.28/533.99 = 276.56/x
  3. Step 3: Cross multiply
    387.28x = 533.99 × 276.56
  4. Step 4: Simplify right side
    387.28x = 147,683.30
  5. Step 5: Solve for x
    x = 147,683.30/387.28
  6. Step 6: Final answer
    x = 381.33

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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.