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Finding the Fourth Proportional to 109.15, 163.62 and 68.45

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Solution

The fourth proportional to 109.15, 163.62 and 68.45 is: 102.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.15 : 163.62 = 68.45 : x
  2. Step 2: Convert to fraction form
    109.15/163.62 = 68.45/x
  3. Step 3: Cross multiply
    109.15x = 163.62 × 68.45
  4. Step 4: Simplify right side
    109.15x = 11,198.97
  5. Step 5: Solve for x
    x = 11,198.97/109.15
  6. Step 6: Final answer
    x = 102.60

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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.