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Finding the Fourth Proportional to 231.18, 318.99 and 137.91

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Solution

The fourth proportional to 231.18, 318.99 and 137.91 is: 190.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.18 : 318.99 = 137.91 : x
  2. Step 2: Convert to fraction form
    231.18/318.99 = 137.91/x
  3. Step 3: Cross multiply
    231.18x = 318.99 × 137.91
  4. Step 4: Simplify right side
    231.18x = 43,991.91
  5. Step 5: Solve for x
    x = 43,991.91/231.18
  6. Step 6: Final answer
    x = 190.29

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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.