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Finding the Fourth Proportional to 221.96, 306.38 and 143.35

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Solution

The fourth proportional to 221.96, 306.38 and 143.35 is: 197.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.96 : 306.38 = 143.35 : x
  2. Step 2: Convert to fraction form
    221.96/306.38 = 143.35/x
  3. Step 3: Cross multiply
    221.96x = 306.38 × 143.35
  4. Step 4: Simplify right side
    221.96x = 43,919.57
  5. Step 5: Solve for x
    x = 43,919.57/221.96
  6. Step 6: Final answer
    x = 197.87

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.