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Finding the Fourth Proportional to 105.98, 158.76 and 85.73

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Solution

The fourth proportional to 105.98, 158.76 and 85.73 is: 128.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.98 : 158.76 = 85.73 : x
  2. Step 2: Convert to fraction form
    105.98/158.76 = 85.73/x
  3. Step 3: Cross multiply
    105.98x = 158.76 × 85.73
  4. Step 4: Simplify right side
    105.98x = 13,609.70
  5. Step 5: Solve for x
    x = 13,609.70/105.98
  6. Step 6: Final answer
    x = 128.42

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.