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Finding the Fourth Proportional to 109.41, 163.84 and 68.70

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Solution

The fourth proportional to 109.41, 163.84 and 68.70 is: 102.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.41 : 163.84 = 68.70 : x
  2. Step 2: Convert to fraction form
    109.41/163.84 = 68.70/x
  3. Step 3: Cross multiply
    109.41x = 163.84 × 68.70
  4. Step 4: Simplify right side
    109.41x = 11,256.05
  5. Step 5: Solve for x
    x = 11,256.05/109.41
  6. Step 6: Final answer
    x = 102.88

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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.