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Finding the Fourth Proportional to 400.94, 552.11 and 391.85

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Solution

The fourth proportional to 400.94, 552.11 and 391.85 is: 539.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.94 : 552.11 = 391.85 : x
  2. Step 2: Convert to fraction form
    400.94/552.11 = 391.85/x
  3. Step 3: Cross multiply
    400.94x = 552.11 × 391.85
  4. Step 4: Simplify right side
    400.94x = 216,342.34
  5. Step 5: Solve for x
    x = 216,342.34/400.94
  6. Step 6: Final answer
    x = 539.59

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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.