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Finding the Fourth Proportional to 276.26, 381.31 and 188.91

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Solution

The fourth proportional to 276.26, 381.31 and 188.91 is: 260.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.26 : 381.31 = 188.91 : x
  2. Step 2: Convert to fraction form
    276.26/381.31 = 188.91/x
  3. Step 3: Cross multiply
    276.26x = 381.31 × 188.91
  4. Step 4: Simplify right side
    276.26x = 72,032.80
  5. Step 5: Solve for x
    x = 72,032.80/276.26
  6. Step 6: Final answer
    x = 260.75

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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.