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Finding the Fourth Proportional to 276.79, 381.90 and 178.68

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Solution

The fourth proportional to 276.79, 381.90 and 178.68 is: 246.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.79 : 381.90 = 178.68 : x
  2. Step 2: Convert to fraction form
    276.79/381.90 = 178.68/x
  3. Step 3: Cross multiply
    276.79x = 381.90 × 178.68
  4. Step 4: Simplify right side
    276.79x = 68,237.89
  5. Step 5: Solve for x
    x = 68,237.89/276.79
  6. Step 6: Final answer
    x = 246.53

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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.