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Finding the Fourth Proportional to 105.44, 157.82 and 84.78

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Solution

The fourth proportional to 105.44, 157.82 and 84.78 is: 126.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.44 : 157.82 = 84.78 : x
  2. Step 2: Convert to fraction form
    105.44/157.82 = 84.78/x
  3. Step 3: Cross multiply
    105.44x = 157.82 × 84.78
  4. Step 4: Simplify right side
    105.44x = 13,379.56
  5. Step 5: Solve for x
    x = 13,379.56/105.44
  6. Step 6: Final answer
    x = 126.90

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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.