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Finding the Fourth Proportional to 141.15, 194.57 and 121.39

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Solution

The fourth proportional to 141.15, 194.57 and 121.39 is: 167.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    141.15 : 194.57 = 121.39 : x
  2. Step 2: Convert to fraction form
    141.15/194.57 = 121.39/x
  3. Step 3: Cross multiply
    141.15x = 194.57 × 121.39
  4. Step 4: Simplify right side
    141.15x = 23,618.85
  5. Step 5: Solve for x
    x = 23,618.85/141.15
  6. Step 6: Final answer
    x = 167.33

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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.