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Finding the Fourth Proportional to 121.98, 182.98 and 49.85

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Solution

The fourth proportional to 121.98, 182.98 and 49.85 is: 74.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    121.98 : 182.98 = 49.85 : x
  2. Step 2: Convert to fraction form
    121.98/182.98 = 49.85/x
  3. Step 3: Cross multiply
    121.98x = 182.98 × 49.85
  4. Step 4: Simplify right side
    121.98x = 9,121.55
  5. Step 5: Solve for x
    x = 9,121.55/121.98
  6. Step 6: Final answer
    x = 74.78

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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.