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Finding the Fourth Proportional to 143.55, 198.30 and 111.22

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Solution

The fourth proportional to 143.55, 198.30 and 111.22 is: 153.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.55 : 198.30 = 111.22 : x
  2. Step 2: Convert to fraction form
    143.55/198.30 = 111.22/x
  3. Step 3: Cross multiply
    143.55x = 198.30 × 111.22
  4. Step 4: Simplify right side
    143.55x = 22,054.85
  5. Step 5: Solve for x
    x = 22,054.85/143.55
  6. Step 6: Final answer
    x = 153.64

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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.