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Finding the Fourth Proportional to 400.43, 600.65 and 126.53

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Solution

The fourth proportional to 400.43, 600.65 and 126.53 is: 189.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.43 : 600.65 = 126.53 : x
  2. Step 2: Convert to fraction form
    400.43/600.65 = 126.53/x
  3. Step 3: Cross multiply
    400.43x = 600.65 × 126.53
  4. Step 4: Simplify right side
    400.43x = 75,997.56
  5. Step 5: Solve for x
    x = 75,997.56/400.43
  6. Step 6: Final answer
    x = 189.79

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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.