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Finding the Fourth Proportional to 221.52, 305.68 and 143.92

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Solution

The fourth proportional to 221.52, 305.68 and 143.92 is: 198.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.52 : 305.68 = 143.92 : x
  2. Step 2: Convert to fraction form
    221.52/305.68 = 143.92/x
  3. Step 3: Cross multiply
    221.52x = 305.68 × 143.92
  4. Step 4: Simplify right side
    221.52x = 43,993.47
  5. Step 5: Solve for x
    x = 43,993.47/221.52
  6. Step 6: Final answer
    x = 198.60

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