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Finding the Fourth Proportional to 143.69, 198.13 and 128.96

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Solution

The fourth proportional to 143.69, 198.13 and 128.96 is: 177.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.69 : 198.13 = 128.96 : x
  2. Step 2: Convert to fraction form
    143.69/198.13 = 128.96/x
  3. Step 3: Cross multiply
    143.69x = 198.13 × 128.96
  4. Step 4: Simplify right side
    143.69x = 25,550.84
  5. Step 5: Solve for x
    x = 25,550.84/143.69
  6. Step 6: Final answer
    x = 177.82

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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.