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Finding the Fourth Proportional to 144.54, 198.21 and 139.08

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Solution

The fourth proportional to 144.54, 198.21 and 139.08 is: 190.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.54 : 198.21 = 139.08 : x
  2. Step 2: Convert to fraction form
    144.54/198.21 = 139.08/x
  3. Step 3: Cross multiply
    144.54x = 198.21 × 139.08
  4. Step 4: Simplify right side
    144.54x = 27,567.05
  5. Step 5: Solve for x
    x = 27,567.05/144.54
  6. Step 6: Final answer
    x = 190.72

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.