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Finding the Fourth Proportional to 105.99, 159 and 45.09

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Solution

The fourth proportional to 105.99, 159 and 45.09 is: 67.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    105.99 : 159 = 45.09 : x
  2. Step 2: Convert to fraction form
    105.99/159 = 45.09/x
  3. Step 3: Cross multiply
    105.99x = 159 × 45.09
  4. Step 4: Simplify right side
    105.99x = 7,169.31
  5. Step 5: Solve for x
    x = 7,169.31/105.99
  6. Step 6: Final answer
    x = 67.64

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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.