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Finding the Fourth Proportional to 276.39, 381.15 and 178.20

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Solution

The fourth proportional to 276.39, 381.15 and 178.20 is: 245.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.39 : 381.15 = 178.20 : x
  2. Step 2: Convert to fraction form
    276.39/381.15 = 178.20/x
  3. Step 3: Cross multiply
    276.39x = 381.15 × 178.20
  4. Step 4: Simplify right side
    276.39x = 67,920.93
  5. Step 5: Solve for x
    x = 67,920.93/276.39
  6. Step 6: Final answer
    x = 245.74

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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.