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Finding the Fourth Proportional to 231.26, 319.02 and 143.78

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Solution

The fourth proportional to 231.26, 319.02 and 143.78 is: 198.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.26 : 319.02 = 143.78 : x
  2. Step 2: Convert to fraction form
    231.26/319.02 = 143.78/x
  3. Step 3: Cross multiply
    231.26x = 319.02 × 143.78
  4. Step 4: Simplify right side
    231.26x = 45,868.70
  5. Step 5: Solve for x
    x = 45,868.70/231.26
  6. Step 6: Final answer
    x = 198.34

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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.