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Finding the Fourth Proportional to 109.12, 163.66 and 78.94

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Solution

The fourth proportional to 109.12, 163.66 and 78.94 is: 118.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.12 : 163.66 = 78.94 : x
  2. Step 2: Convert to fraction form
    109.12/163.66 = 78.94/x
  3. Step 3: Cross multiply
    109.12x = 163.66 × 78.94
  4. Step 4: Simplify right side
    109.12x = 12,919.32
  5. Step 5: Solve for x
    x = 12,919.32/109.12
  6. Step 6: Final answer
    x = 118.40

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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.