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Finding the Fourth Proportional to 400.32, 600.45 and 111.78

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Solution

The fourth proportional to 400.32, 600.45 and 111.78 is: 167.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.32 : 600.45 = 111.78 : x
  2. Step 2: Convert to fraction form
    400.32/600.45 = 111.78/x
  3. Step 3: Cross multiply
    400.32x = 600.45 × 111.78
  4. Step 4: Simplify right side
    400.32x = 67,118.30
  5. Step 5: Solve for x
    x = 67,118.30/400.32
  6. Step 6: Final answer
    x = 167.66

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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.