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Finding the Fourth Proportional to 401.38, 553.78 and 226.69

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Solution

The fourth proportional to 401.38, 553.78 and 226.69 is: 312.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.38 : 553.78 = 226.69 : x
  2. Step 2: Convert to fraction form
    401.38/553.78 = 226.69/x
  3. Step 3: Cross multiply
    401.38x = 553.78 × 226.69
  4. Step 4: Simplify right side
    401.38x = 125,536.39
  5. Step 5: Solve for x
    x = 125,536.39/401.38
  6. Step 6: Final answer
    x = 312.76

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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.