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Finding the Fourth Proportional to 401.47, 553.98 and 226.78

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Solution

The fourth proportional to 401.47, 553.98 and 226.78 is: 312.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.47 : 553.98 = 226.78 : x
  2. Step 2: Convert to fraction form
    401.47/553.98 = 226.78/x
  3. Step 3: Cross multiply
    401.47x = 553.98 × 226.78
  4. Step 4: Simplify right side
    401.47x = 125,631.58
  5. Step 5: Solve for x
    x = 125,631.58/401.47
  6. Step 6: Final answer
    x = 312.93

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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.