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Finding the Fourth Proportional to 161.20, 241.60 and 69.79

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Solution

The fourth proportional to 161.20, 241.60 and 69.79 is: 104.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.20 : 241.60 = 69.79 : x
  2. Step 2: Convert to fraction form
    161.20/241.60 = 69.79/x
  3. Step 3: Cross multiply
    161.20x = 241.60 × 69.79
  4. Step 4: Simplify right side
    161.20x = 16,862.07
  5. Step 5: Solve for x
    x = 16,862.07/161.20
  6. Step 6: Final answer
    x = 104.60

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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.