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Finding the Fourth Proportional to 118.63, 163.38 and 104.05

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Solution

The fourth proportional to 118.63, 163.38 and 104.05 is: 143.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.63 : 163.38 = 104.05 : x
  2. Step 2: Convert to fraction form
    118.63/163.38 = 104.05/x
  3. Step 3: Cross multiply
    118.63x = 163.38 × 104.05
  4. Step 4: Simplify right side
    118.63x = 16,999.69
  5. Step 5: Solve for x
    x = 16,999.69/118.63
  6. Step 6: Final answer
    x = 143.30

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.