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Finding the Fourth Proportional to 161.36, 241.75 and 84.21

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Solution

The fourth proportional to 161.36, 241.75 and 84.21 is: 126.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.36 : 241.75 = 84.21 : x
  2. Step 2: Convert to fraction form
    161.36/241.75 = 84.21/x
  3. Step 3: Cross multiply
    161.36x = 241.75 × 84.21
  4. Step 4: Simplify right side
    161.36x = 20,357.77
  5. Step 5: Solve for x
    x = 20,357.77/161.36
  6. Step 6: Final answer
    x = 126.16

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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.