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Finding the Fourth Proportional to 231.15, 318.90 and 137.88

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Solution

The fourth proportional to 231.15, 318.90 and 137.88 is: 190.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.15 : 318.90 = 137.88 : x
  2. Step 2: Convert to fraction form
    231.15/318.90 = 137.88/x
  3. Step 3: Cross multiply
    231.15x = 318.90 × 137.88
  4. Step 4: Simplify right side
    231.15x = 43,969.93
  5. Step 5: Solve for x
    x = 43,969.93/231.15
  6. Step 6: Final answer
    x = 190.22

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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.