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Finding the Fourth Proportional to 109.15, 163.45 and 107.93

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Solution

The fourth proportional to 109.15, 163.45 and 107.93 is: 161.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.15 : 163.45 = 107.93 : x
  2. Step 2: Convert to fraction form
    109.15/163.45 = 107.93/x
  3. Step 3: Cross multiply
    109.15x = 163.45 × 107.93
  4. Step 4: Simplify right side
    109.15x = 17,641.70
  5. Step 5: Solve for x
    x = 17,641.70/109.15
  6. Step 6: Final answer
    x = 161.63

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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.