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Finding the Fourth Proportional to 400.52, 600.78 and 126.61

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Solution

The fourth proportional to 400.52, 600.78 and 126.61 is: 189.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.52 : 600.78 = 126.61 : x
  2. Step 2: Convert to fraction form
    400.52/600.78 = 126.61/x
  3. Step 3: Cross multiply
    400.52x = 600.78 × 126.61
  4. Step 4: Simplify right side
    400.52x = 76,064.76
  5. Step 5: Solve for x
    x = 76,064.76/400.52
  6. Step 6: Final answer
    x = 189.92

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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.