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Finding the Fourth Proportional to 400.85, 601.42 and 140.87

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Solution

The fourth proportional to 400.85, 601.42 and 140.87 is: 211.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    400.85 : 601.42 = 140.87 : x
  2. Step 2: Convert to fraction form
    400.85/601.42 = 140.87/x
  3. Step 3: Cross multiply
    400.85x = 601.42 × 140.87
  4. Step 4: Simplify right side
    400.85x = 84,723.76
  5. Step 5: Solve for x
    x = 84,723.76/400.85
  6. Step 6: Final answer
    x = 211.36

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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.