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Finding the Fourth Proportional to 221.01, 331.37 and 143.92

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Solution

The fourth proportional to 221.01, 331.37 and 143.92 is: 215.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.01 : 331.37 = 143.92 : x
  2. Step 2: Convert to fraction form
    221.01/331.37 = 143.92/x
  3. Step 3: Cross multiply
    221.01x = 331.37 × 143.92
  4. Step 4: Simplify right side
    221.01x = 47,690.77
  5. Step 5: Solve for x
    x = 47,690.77/221.01
  6. Step 6: Final answer
    x = 215.79

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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.