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Finding the Fourth Proportional to 161.20, 241.80 and 80

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Solution

The fourth proportional to 161.20, 241.80 and 80 is: 120.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.20 : 241.80 = 80 : x
  2. Step 2: Convert to fraction form
    161.20/241.80 = 80/x
  3. Step 3: Cross multiply
    161.20x = 241.80 × 80
  4. Step 4: Simplify right side
    161.20x = 19,344
  5. Step 5: Solve for x
    x = 19,344/161.20
  6. Step 6: Final answer
    x = 120.00

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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.