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Finding the Fourth Proportional to 105.91, 158 and 98.05

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Solution

The fourth proportional to 105.91, 158 and 98.05 is: 146.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.91 : 158 = 98.05 : x
  2. Step 2: Convert to fraction form
    105.91/158 = 98.05/x
  3. Step 3: Cross multiply
    105.91x = 158 × 98.05
  4. Step 4: Simplify right side
    105.91x = 15,491.90
  5. Step 5: Solve for x
    x = 15,491.90/105.91
  6. Step 6: Final answer
    x = 146.27

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.