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Finding the Fourth Proportional to 400.96, 553.21 and 253.54

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Solution

The fourth proportional to 400.96, 553.21 and 253.54 is: 349.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.96 : 553.21 = 253.54 : x
  2. Step 2: Convert to fraction form
    400.96/553.21 = 253.54/x
  3. Step 3: Cross multiply
    400.96x = 553.21 × 253.54
  4. Step 4: Simplify right side
    400.96x = 140,260.86
  5. Step 5: Solve for x
    x = 140,260.86/400.96
  6. Step 6: Final answer
    x = 349.81

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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.