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Finding the Fourth Proportional to 143.90, 198.76 and 111.54

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Solution

The fourth proportional to 143.90, 198.76 and 111.54 is: 154.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.90 : 198.76 = 111.54 : x
  2. Step 2: Convert to fraction form
    143.90/198.76 = 111.54/x
  3. Step 3: Cross multiply
    143.90x = 198.76 × 111.54
  4. Step 4: Simplify right side
    143.90x = 22,169.69
  5. Step 5: Solve for x
    x = 22,169.69/143.90
  6. Step 6: Final answer
    x = 154.06

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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.