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Finding the Fourth Proportional to 418.20, 576.71 and 276.15

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Solution

The fourth proportional to 418.20, 576.71 and 276.15 is: 380.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.20 : 576.71 = 276.15 : x
  2. Step 2: Convert to fraction form
    418.20/576.71 = 276.15/x
  3. Step 3: Cross multiply
    418.20x = 576.71 × 276.15
  4. Step 4: Simplify right side
    418.20x = 159,258.47
  5. Step 5: Solve for x
    x = 159,258.47/418.20
  6. Step 6: Final answer
    x = 380.82

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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.