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Finding the Fourth Proportional to 168.90, 252.99 and 121.02

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Solution

The fourth proportional to 168.90, 252.99 and 121.02 is: 181.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.90 : 252.99 = 121.02 : x
  2. Step 2: Convert to fraction form
    168.90/252.99 = 121.02/x
  3. Step 3: Cross multiply
    168.90x = 252.99 × 121.02
  4. Step 4: Simplify right side
    168.90x = 30,616.85
  5. Step 5: Solve for x
    x = 30,616.85/168.90
  6. Step 6: Final answer
    x = 181.27

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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.