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Finding the Fourth Proportional to 161.21, 241.30 and 115.33

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Solution

The fourth proportional to 161.21, 241.30 and 115.33 is: 172.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.21 : 241.30 = 115.33 : x
  2. Step 2: Convert to fraction form
    161.21/241.30 = 115.33/x
  3. Step 3: Cross multiply
    161.21x = 241.30 × 115.33
  4. Step 4: Simplify right side
    161.21x = 27,828.70
  5. Step 5: Solve for x
    x = 27,828.70/161.21
  6. Step 6: Final answer
    x = 172.63

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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.