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Finding the Fourth Proportional to 231.20, 319.02 and 143.86

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Solution

The fourth proportional to 231.20, 319.02 and 143.86 is: 198.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.20 : 319.02 = 143.86 : x
  2. Step 2: Convert to fraction form
    231.20/319.02 = 143.86/x
  3. Step 3: Cross multiply
    231.20x = 319.02 × 143.86
  4. Step 4: Simplify right side
    231.20x = 45,894.22
  5. Step 5: Solve for x
    x = 45,894.22/231.20
  6. Step 6: Final answer
    x = 198.50

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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.