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Finding the Fourth Proportional to 400.87, 600.85 and 189.90

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Solution

The fourth proportional to 400.87, 600.85 and 189.90 is: 284.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.87 : 600.85 = 189.90 : x
  2. Step 2: Convert to fraction form
    400.87/600.85 = 189.90/x
  3. Step 3: Cross multiply
    400.87x = 600.85 × 189.90
  4. Step 4: Simplify right side
    400.87x = 114,101.42
  5. Step 5: Solve for x
    x = 114,101.42/400.87
  6. Step 6: Final answer
    x = 284.63

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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.