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Finding the Fourth Proportional to 168.54, 251.61 and 142.68

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Solution

The fourth proportional to 168.54, 251.61 and 142.68 is: 213.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.54 : 251.61 = 142.68 : x
  2. Step 2: Convert to fraction form
    168.54/251.61 = 142.68/x
  3. Step 3: Cross multiply
    168.54x = 251.61 × 142.68
  4. Step 4: Simplify right side
    168.54x = 35,900.12
  5. Step 5: Solve for x
    x = 35,900.12/168.54
  6. Step 6: Final answer
    x = 213.01

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.