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Finding the Fourth Proportional to 109.20, 163.57 and 71.99

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Solution

The fourth proportional to 109.20, 163.57 and 71.99 is: 107.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.20 : 163.57 = 71.99 : x
  2. Step 2: Convert to fraction form
    109.20/163.57 = 71.99/x
  3. Step 3: Cross multiply
    109.20x = 163.57 × 71.99
  4. Step 4: Simplify right side
    109.20x = 11,775.15
  5. Step 5: Solve for x
    x = 11,775.15/109.20
  6. Step 6: Final answer
    x = 107.83

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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.