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Finding the Fourth Proportional to 109.44, 163.46 and 91.42

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Solution

The fourth proportional to 109.44, 163.46 and 91.42 is: 136.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.44 : 163.46 = 91.42 : x
  2. Step 2: Convert to fraction form
    109.44/163.46 = 91.42/x
  3. Step 3: Cross multiply
    109.44x = 163.46 × 91.42
  4. Step 4: Simplify right side
    109.44x = 14,943.33
  5. Step 5: Solve for x
    x = 14,943.33/109.44
  6. Step 6: Final answer
    x = 136.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.