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Finding the Fourth Proportional to 221.92, 305.92 and 178.28

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Solution

The fourth proportional to 221.92, 305.92 and 178.28 is: 245.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.92 : 305.92 = 178.28 : x
  2. Step 2: Convert to fraction form
    221.92/305.92 = 178.28/x
  3. Step 3: Cross multiply
    221.92x = 305.92 × 178.28
  4. Step 4: Simplify right side
    221.92x = 54,539.42
  5. Step 5: Solve for x
    x = 54,539.42/221.92
  6. Step 6: Final answer
    x = 245.76

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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.