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Finding the Fourth Proportional to 143.43, 198.24 and 128.58

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Solution

The fourth proportional to 143.43, 198.24 and 128.58 is: 177.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.43 : 198.24 = 128.58 : x
  2. Step 2: Convert to fraction form
    143.43/198.24 = 128.58/x
  3. Step 3: Cross multiply
    143.43x = 198.24 × 128.58
  4. Step 4: Simplify right side
    143.43x = 25,489.70
  5. Step 5: Solve for x
    x = 25,489.70/143.43
  6. Step 6: Final answer
    x = 177.72

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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.