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Finding the Fourth Proportional to 401.38, 553.90 and 217.38

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Solution

The fourth proportional to 401.38, 553.90 and 217.38 is: 299.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    401.38 : 553.90 = 217.38 : x
  2. Step 2: Convert to fraction form
    401.38/553.90 = 217.38/x
  3. Step 3: Cross multiply
    401.38x = 553.90 × 217.38
  4. Step 4: Simplify right side
    401.38x = 120,406.78
  5. Step 5: Solve for x
    x = 120,406.78/401.38
  6. Step 6: Final answer
    x = 299.98

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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.