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Finding the Fourth Proportional to 231.07, 318.87 and 143.71

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Solution

The fourth proportional to 231.07, 318.87 and 143.71 is: 198.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.07 : 318.87 = 143.71 : x
  2. Step 2: Convert to fraction form
    231.07/318.87 = 143.71/x
  3. Step 3: Cross multiply
    231.07x = 318.87 × 143.71
  4. Step 4: Simplify right side
    231.07x = 45,824.81
  5. Step 5: Solve for x
    x = 45,824.81/231.07
  6. Step 6: Final answer
    x = 198.32

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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.