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Finding the Fourth Proportional to 400.88, 553.21 and 216.88

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Solution

The fourth proportional to 400.88, 553.21 and 216.88 is: 299.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.88 : 553.21 = 216.88 : x
  2. Step 2: Convert to fraction form
    400.88/553.21 = 216.88/x
  3. Step 3: Cross multiply
    400.88x = 553.21 × 216.88
  4. Step 4: Simplify right side
    400.88x = 119,977.42
  5. Step 5: Solve for x
    x = 119,977.42/400.88
  6. Step 6: Final answer
    x = 299.29

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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.