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Finding the Fourth Proportional to 168.24, 251.99 and 76.81

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Solution

The fourth proportional to 168.24, 251.99 and 76.81 is: 115.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.24 : 251.99 = 76.81 : x
  2. Step 2: Convert to fraction form
    168.24/251.99 = 76.81/x
  3. Step 3: Cross multiply
    168.24x = 251.99 × 76.81
  4. Step 4: Simplify right side
    168.24x = 19,355.35
  5. Step 5: Solve for x
    x = 19,355.35/168.24
  6. Step 6: Final answer
    x = 115.05

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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.