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Finding the Fourth Proportional to 399.80, 554.24 and 377.90

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Solution

The fourth proportional to 399.80, 554.24 and 377.90 is: 523.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.80 : 554.24 = 377.90 : x
  2. Step 2: Convert to fraction form
    399.80/554.24 = 377.90/x
  3. Step 3: Cross multiply
    399.80x = 554.24 × 377.90
  4. Step 4: Simplify right side
    399.80x = 209,447.30
  5. Step 5: Solve for x
    x = 209,447.30/399.80
  6. Step 6: Final answer
    x = 523.88

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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.