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Finding the Fourth Proportional to 221.64, 305.85 and 143.04

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Solution

The fourth proportional to 221.64, 305.85 and 143.04 is: 197.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.64 : 305.85 = 143.04 : x
  2. Step 2: Convert to fraction form
    221.64/305.85 = 143.04/x
  3. Step 3: Cross multiply
    221.64x = 305.85 × 143.04
  4. Step 4: Simplify right side
    221.64x = 43,748.78
  5. Step 5: Solve for x
    x = 43,748.78/221.64
  6. Step 6: Final answer
    x = 197.39

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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.