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Finding the Fourth Proportional to 276.25, 381.30 and 187.86

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Solution

The fourth proportional to 276.25, 381.30 and 187.86 is: 259.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.25 : 381.30 = 187.86 : x
  2. Step 2: Convert to fraction form
    276.25/381.30 = 187.86/x
  3. Step 3: Cross multiply
    276.25x = 381.30 × 187.86
  4. Step 4: Simplify right side
    276.25x = 71,631.02
  5. Step 5: Solve for x
    x = 71,631.02/276.25
  6. Step 6: Final answer
    x = 259.30

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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.