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Finding the Fourth Proportional to 161.11, 241.59 and 69.78

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Solution

The fourth proportional to 161.11, 241.59 and 69.78 is: 104.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.11 : 241.59 = 69.78 : x
  2. Step 2: Convert to fraction form
    161.11/241.59 = 69.78/x
  3. Step 3: Cross multiply
    161.11x = 241.59 × 69.78
  4. Step 4: Simplify right side
    161.11x = 16,858.15
  5. Step 5: Solve for x
    x = 16,858.15/161.11
  6. Step 6: Final answer
    x = 104.64

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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.