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Finding the Fourth Proportional to 399.76, 554.24 and 377.92

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Solution

The fourth proportional to 399.76, 554.24 and 377.92 is: 523.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.76 : 554.24 = 377.92 : x
  2. Step 2: Convert to fraction form
    399.76/554.24 = 377.92/x
  3. Step 3: Cross multiply
    399.76x = 554.24 × 377.92
  4. Step 4: Simplify right side
    399.76x = 209,458.38
  5. Step 5: Solve for x
    x = 209,458.38/399.76
  6. Step 6: Final answer
    x = 523.96

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.