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Finding the Fourth Proportional to 168.78, 253.19 and 107.79

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Solution

The fourth proportional to 168.78, 253.19 and 107.79 is: 161.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.78 : 253.19 = 107.79 : x
  2. Step 2: Convert to fraction form
    168.78/253.19 = 107.79/x
  3. Step 3: Cross multiply
    168.78x = 253.19 × 107.79
  4. Step 4: Simplify right side
    168.78x = 27,290.81
  5. Step 5: Solve for x
    x = 27,290.81/168.78
  6. Step 6: Final answer
    x = 161.69

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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.