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Finding the Fourth Proportional to 131.39, 197.19 and 121.13

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Solution

The fourth proportional to 131.39, 197.19 and 121.13 is: 181.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.39 : 197.19 = 121.13 : x
  2. Step 2: Convert to fraction form
    131.39/197.19 = 121.13/x
  3. Step 3: Cross multiply
    131.39x = 197.19 × 121.13
  4. Step 4: Simplify right side
    131.39x = 23,884.64
  5. Step 5: Solve for x
    x = 23,884.64/131.39
  6. Step 6: Final answer
    x = 181.79

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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.