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Finding the Fourth Proportional to 143.68, 197.42 and 128.80

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Solution

The fourth proportional to 143.68, 197.42 and 128.80 is: 176.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.68 : 197.42 = 128.80 : x
  2. Step 2: Convert to fraction form
    143.68/197.42 = 128.80/x
  3. Step 3: Cross multiply
    143.68x = 197.42 × 128.80
  4. Step 4: Simplify right side
    143.68x = 25,427.70
  5. Step 5: Solve for x
    x = 25,427.70/143.68
  6. Step 6: Final answer
    x = 176.97

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.