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Finding the Fourth Proportional to 399.89, 599.85 and 126.18

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Solution

The fourth proportional to 399.89, 599.85 and 126.18 is: 189.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    399.89 : 599.85 = 126.18 : x
  2. Step 2: Convert to fraction form
    399.89/599.85 = 126.18/x
  3. Step 3: Cross multiply
    399.89x = 599.85 × 126.18
  4. Step 4: Simplify right side
    399.89x = 75,686.88
  5. Step 5: Solve for x
    x = 75,686.88/399.89
  6. Step 6: Final answer
    x = 189.27

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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.