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Finding the Fourth Proportional to 400.10, 600.12 and 126.20

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Solution

The fourth proportional to 400.10, 600.12 and 126.20 is: 189.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.10 : 600.12 = 126.20 : x
  2. Step 2: Convert to fraction form
    400.10/600.12 = 126.20/x
  3. Step 3: Cross multiply
    400.10x = 600.12 × 126.20
  4. Step 4: Simplify right side
    400.10x = 75,735.14
  5. Step 5: Solve for x
    x = 75,735.14/400.10
  6. Step 6: Final answer
    x = 189.29

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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.