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Finding the Fourth Proportional to 144.44, 198.98 and 139

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Solution

The fourth proportional to 144.44, 198.98 and 139 is: 191.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.44 : 198.98 = 139 : x
  2. Step 2: Convert to fraction form
    144.44/198.98 = 139/x
  3. Step 3: Cross multiply
    144.44x = 198.98 × 139
  4. Step 4: Simplify right side
    144.44x = 27,658.22
  5. Step 5: Solve for x
    x = 27,658.22/144.44
  6. Step 6: Final answer
    x = 191.49

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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.