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Finding the Fourth Proportional to 400.66, 553.11 and 282.90

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Solution

The fourth proportional to 400.66, 553.11 and 282.90 is: 390.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.66 : 553.11 = 282.90 : x
  2. Step 2: Convert to fraction form
    400.66/553.11 = 282.90/x
  3. Step 3: Cross multiply
    400.66x = 553.11 × 282.90
  4. Step 4: Simplify right side
    400.66x = 156,474.82
  5. Step 5: Solve for x
    x = 156,474.82/400.66
  6. Step 6: Final answer
    x = 390.54

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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.