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Finding the Fourth Proportional to 144.16, 198.50 and 121.94

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Solution

The fourth proportional to 144.16, 198.50 and 121.94 is: 167.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.16 : 198.50 = 121.94 : x
  2. Step 2: Convert to fraction form
    144.16/198.50 = 121.94/x
  3. Step 3: Cross multiply
    144.16x = 198.50 × 121.94
  4. Step 4: Simplify right side
    144.16x = 24,205.09
  5. Step 5: Solve for x
    x = 24,205.09/144.16
  6. Step 6: Final answer
    x = 167.90

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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.