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Finding the Fourth Proportional to 276.05, 380.15 and 220.61

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Solution

The fourth proportional to 276.05, 380.15 and 220.61 is: 303.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.05 : 380.15 = 220.61 : x
  2. Step 2: Convert to fraction form
    276.05/380.15 = 220.61/x
  3. Step 3: Cross multiply
    276.05x = 380.15 × 220.61
  4. Step 4: Simplify right side
    276.05x = 83,864.89
  5. Step 5: Solve for x
    x = 83,864.89/276.05
  6. Step 6: Final answer
    x = 303.80

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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.