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Finding the Fourth Proportional to 231.14, 318.94 and 142.64

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Solution

The fourth proportional to 231.14, 318.94 and 142.64 is: 196.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.14 : 318.94 = 142.64 : x
  2. Step 2: Convert to fraction form
    231.14/318.94 = 142.64/x
  3. Step 3: Cross multiply
    231.14x = 318.94 × 142.64
  4. Step 4: Simplify right side
    231.14x = 45,491.65
  5. Step 5: Solve for x
    x = 45,491.65/231.14
  6. Step 6: Final answer
    x = 196.81

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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.