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Finding the Fourth Proportional to 221.42, 305.62 and 143.66

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Solution

The fourth proportional to 221.42, 305.62 and 143.66 is: 198.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.42 : 305.62 = 143.66 : x
  2. Step 2: Convert to fraction form
    221.42/305.62 = 143.66/x
  3. Step 3: Cross multiply
    221.42x = 305.62 × 143.66
  4. Step 4: Simplify right side
    221.42x = 43,905.37
  5. Step 5: Solve for x
    x = 43,905.37/221.42
  6. Step 6: Final answer
    x = 198.29

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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.