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Finding the Fourth Proportional to 408.88, 613.27 and 399.76

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Solution

The fourth proportional to 408.88, 613.27 and 399.76 is: 599.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.88 : 613.27 = 399.76 : x
  2. Step 2: Convert to fraction form
    408.88/613.27 = 399.76/x
  3. Step 3: Cross multiply
    408.88x = 613.27 × 399.76
  4. Step 4: Simplify right side
    408.88x = 245,160.82
  5. Step 5: Solve for x
    x = 245,160.82/408.88
  6. Step 6: Final answer
    x = 599.59

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.