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Finding the Fourth Proportional to 118.50, 163.55 and 74.85

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Solution

The fourth proportional to 118.50, 163.55 and 74.85 is: 103.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.50 : 163.55 = 74.85 : x
  2. Step 2: Convert to fraction form
    118.50/163.55 = 74.85/x
  3. Step 3: Cross multiply
    118.50x = 163.55 × 74.85
  4. Step 4: Simplify right side
    118.50x = 12,241.34
  5. Step 5: Solve for x
    x = 12,241.34/118.50
  6. Step 6: Final answer
    x = 103.30

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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.