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Finding the Fourth Proportional to 143.10, 197.45 and 80.91

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Solution

The fourth proportional to 143.10, 197.45 and 80.91 is: 111.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    143.10 : 197.45 = 80.91 : x
  2. Step 2: Convert to fraction form
    143.10/197.45 = 80.91/x
  3. Step 3: Cross multiply
    143.10x = 197.45 × 80.91
  4. Step 4: Simplify right side
    143.10x = 15,974.69
  5. Step 5: Solve for x
    x = 15,974.69/143.10
  6. Step 6: Final answer
    x = 111.64

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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.