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Finding the Fourth Proportional to 231.17, 318.97 and 137.90

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Solution

The fourth proportional to 231.17, 318.97 and 137.90 is: 190.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    231.17 : 318.97 = 137.90 : x
  2. Step 2: Convert to fraction form
    231.17/318.97 = 137.90/x
  3. Step 3: Cross multiply
    231.17x = 318.97 × 137.90
  4. Step 4: Simplify right side
    231.17x = 43,985.96
  5. Step 5: Solve for x
    x = 43,985.96/231.17
  6. Step 6: Final answer
    x = 190.28

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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.