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Finding the Fourth Proportional to 276.51, 381.60 and 198.75

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Solution

The fourth proportional to 276.51, 381.60 and 198.75 is: 274.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.51 : 381.60 = 198.75 : x
  2. Step 2: Convert to fraction form
    276.51/381.60 = 198.75/x
  3. Step 3: Cross multiply
    276.51x = 381.60 × 198.75
  4. Step 4: Simplify right side
    276.51x = 75,843
  5. Step 5: Solve for x
    x = 75,843/276.51
  6. Step 6: Final answer
    x = 274.29

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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.