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Finding the Fourth Proportional to 144.16, 198.86 and 111.36

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Solution

The fourth proportional to 144.16, 198.86 and 111.36 is: 153.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    144.16 : 198.86 = 111.36 : x
  2. Step 2: Convert to fraction form
    144.16/198.86 = 111.36/x
  3. Step 3: Cross multiply
    144.16x = 198.86 × 111.36
  4. Step 4: Simplify right side
    144.16x = 22,145.05
  5. Step 5: Solve for x
    x = 22,145.05/144.16
  6. Step 6: Final answer
    x = 153.61

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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.