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Finding the Fourth Proportional to 121.40, 182.05 and 40.22

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Solution

The fourth proportional to 121.40, 182.05 and 40.22 is: 60.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.40 : 182.05 = 40.22 : x
  2. Step 2: Convert to fraction form
    121.40/182.05 = 40.22/x
  3. Step 3: Cross multiply
    121.40x = 182.05 × 40.22
  4. Step 4: Simplify right side
    121.40x = 7,321.72
  5. Step 5: Solve for x
    x = 7,321.72/121.40
  6. Step 6: Final answer
    x = 60.31

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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.