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Finding the Fourth Proportional to 237.15, 327.31 and 138.90

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Solution

The fourth proportional to 237.15, 327.31 and 138.90 is: 191.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    237.15 : 327.31 = 138.90 : x
  2. Step 2: Convert to fraction form
    237.15/327.31 = 138.90/x
  3. Step 3: Cross multiply
    237.15x = 327.31 × 138.90
  4. Step 4: Simplify right side
    237.15x = 45,463.36
  5. Step 5: Solve for x
    x = 45,463.36/237.15
  6. Step 6: Final answer
    x = 191.71

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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.