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Finding the Fourth Proportional to 121.40, 182.15 and 113.81

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Solution

The fourth proportional to 121.40, 182.15 and 113.81 is: 170.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.40 : 182.15 = 113.81 : x
  2. Step 2: Convert to fraction form
    121.40/182.15 = 113.81/x
  3. Step 3: Cross multiply
    121.40x = 182.15 × 113.81
  4. Step 4: Simplify right side
    121.40x = 20,729.44
  5. Step 5: Solve for x
    x = 20,729.44/121.40
  6. Step 6: Final answer
    x = 170.75

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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.