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Finding the Fourth Proportional to 221.13, 304.97 and 143.64

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Solution

The fourth proportional to 221.13, 304.97 and 143.64 is: 198.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    221.13 : 304.97 = 143.64 : x
  2. Step 2: Convert to fraction form
    221.13/304.97 = 143.64/x
  3. Step 3: Cross multiply
    221.13x = 304.97 × 143.64
  4. Step 4: Simplify right side
    221.13x = 43,805.17
  5. Step 5: Solve for x
    x = 43,805.17/221.13
  6. Step 6: Final answer
    x = 198.10

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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.