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Finding the Fourth Proportional to 231.14, 318.78 and 143.72

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Solution

The fourth proportional to 231.14, 318.78 and 143.72 is: 198.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.14 : 318.78 = 143.72 : x
  2. Step 2: Convert to fraction form
    231.14/318.78 = 143.72/x
  3. Step 3: Cross multiply
    231.14x = 318.78 × 143.72
  4. Step 4: Simplify right side
    231.14x = 45,815.06
  5. Step 5: Solve for x
    x = 45,815.06/231.14
  6. Step 6: Final answer
    x = 198.21

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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.