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Finding the Fourth Proportional to 399.98, 599.96 and 126.09

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Solution

The fourth proportional to 399.98, 599.96 and 126.09 is: 189.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.98 : 599.96 = 126.09 : x
  2. Step 2: Convert to fraction form
    399.98/599.96 = 126.09/x
  3. Step 3: Cross multiply
    399.98x = 599.96 × 126.09
  4. Step 4: Simplify right side
    399.98x = 75,648.09
  5. Step 5: Solve for x
    x = 75,648.09/399.98
  6. Step 6: Final answer
    x = 189.13

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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.