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Finding the Fourth Proportional to 109.18, 163.78 and 74.40

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Solution

The fourth proportional to 109.18, 163.78 and 74.40 is: 111.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    109.18 : 163.78 = 74.40 : x
  2. Step 2: Convert to fraction form
    109.18/163.78 = 74.40/x
  3. Step 3: Cross multiply
    109.18x = 163.78 × 74.40
  4. Step 4: Simplify right side
    109.18x = 12,185.23
  5. Step 5: Solve for x
    x = 12,185.23/109.18
  6. Step 6: Final answer
    x = 111.61

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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.