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Finding the Fourth Proportional to 109.16, 163.62 and 68.59

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Solution

The fourth proportional to 109.16, 163.62 and 68.59 is: 102.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.16 : 163.62 = 68.59 : x
  2. Step 2: Convert to fraction form
    109.16/163.62 = 68.59/x
  3. Step 3: Cross multiply
    109.16x = 163.62 × 68.59
  4. Step 4: Simplify right side
    109.16x = 11,222.90
  5. Step 5: Solve for x
    x = 11,222.90/109.16
  6. Step 6: Final answer
    x = 102.81

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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.