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Finding the Fourth Proportional to 168.89, 254.48 and 139.12

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Solution

The fourth proportional to 168.89, 254.48 and 139.12 is: 209.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.89 : 254.48 = 139.12 : x
  2. Step 2: Convert to fraction form
    168.89/254.48 = 139.12/x
  3. Step 3: Cross multiply
    168.89x = 254.48 × 139.12
  4. Step 4: Simplify right side
    168.89x = 35,401.93
  5. Step 5: Solve for x
    x = 35,401.93/168.89
  6. Step 6: Final answer
    x = 209.62

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.