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Finding the Fourth Proportional to 276.41, 381.65 and 206.55

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Solution

The fourth proportional to 276.41, 381.65 and 206.55 is: 285.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.41 : 381.65 = 206.55 : x
  2. Step 2: Convert to fraction form
    276.41/381.65 = 206.55/x
  3. Step 3: Cross multiply
    276.41x = 381.65 × 206.55
  4. Step 4: Simplify right side
    276.41x = 78,828.77
  5. Step 5: Solve for x
    x = 78,828.77/276.41
  6. Step 6: Final answer
    x = 285.19

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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.