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Finding the Fourth Proportional to 161.15, 241.70 and 84.15

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Solution

The fourth proportional to 161.15, 241.70 and 84.15 is: 126.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    161.15 : 241.70 = 84.15 : x
  2. Step 2: Convert to fraction form
    161.15/241.70 = 84.15/x
  3. Step 3: Cross multiply
    161.15x = 241.70 × 84.15
  4. Step 4: Simplify right side
    161.15x = 20,338.63
  5. Step 5: Solve for x
    x = 20,338.63/161.15
  6. Step 6: Final answer
    x = 126.21

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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.