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Finding the Fourth Proportional to 276.15, 381.11 and 151.81

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Solution

The fourth proportional to 276.15, 381.11 and 151.81 is: 209.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.15 : 381.11 = 151.81 : x
  2. Step 2: Convert to fraction form
    276.15/381.11 = 151.81/x
  3. Step 3: Cross multiply
    276.15x = 381.11 × 151.81
  4. Step 4: Simplify right side
    276.15x = 57,856.21
  5. Step 5: Solve for x
    x = 57,856.21/276.15
  6. Step 6: Final answer
    x = 209.51

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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.