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Finding the Fourth Proportional to 400.91, 553.28 and 253.49

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Solution

The fourth proportional to 400.91, 553.28 and 253.49 is: 349.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.91 : 553.28 = 253.49 : x
  2. Step 2: Convert to fraction form
    400.91/553.28 = 253.49/x
  3. Step 3: Cross multiply
    400.91x = 553.28 × 253.49
  4. Step 4: Simplify right side
    400.91x = 140,249.25
  5. Step 5: Solve for x
    x = 140,249.25/400.91
  6. Step 6: Final answer
    x = 349.83

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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.