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Finding the Fourth Proportional to 276.80, 381.90 and 166.30

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Solution

The fourth proportional to 276.80, 381.90 and 166.30 is: 229.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.80 : 381.90 = 166.30 : x
  2. Step 2: Convert to fraction form
    276.80/381.90 = 166.30/x
  3. Step 3: Cross multiply
    276.80x = 381.90 × 166.30
  4. Step 4: Simplify right side
    276.80x = 63,509.97
  5. Step 5: Solve for x
    x = 63,509.97/276.80
  6. Step 6: Final answer
    x = 229.44

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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.