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Finding the Fourth Proportional to 118.80, 163.89 and 75.15

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Solution

The fourth proportional to 118.80, 163.89 and 75.15 is: 103.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.80 : 163.89 = 75.15 : x
  2. Step 2: Convert to fraction form
    118.80/163.89 = 75.15/x
  3. Step 3: Cross multiply
    118.80x = 163.89 × 75.15
  4. Step 4: Simplify right side
    118.80x = 12,316.33
  5. Step 5: Solve for x
    x = 12,316.33/118.80
  6. Step 6: Final answer
    x = 103.67

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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.