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Finding the Fourth Proportional to 131.31, 197.08 and 121.75

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Solution

The fourth proportional to 131.31, 197.08 and 121.75 is: 182.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.31 : 197.08 = 121.75 : x
  2. Step 2: Convert to fraction form
    131.31/197.08 = 121.75/x
  3. Step 3: Cross multiply
    131.31x = 197.08 × 121.75
  4. Step 4: Simplify right side
    131.31x = 23,993.69
  5. Step 5: Solve for x
    x = 23,993.69/131.31
  6. Step 6: Final answer
    x = 182.73

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.