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Finding the Fourth Proportional to 168.21, 231.91 and 112.83

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Solution

The fourth proportional to 168.21, 231.91 and 112.83 is: 155.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.21 : 231.91 = 112.83 : x
  2. Step 2: Convert to fraction form
    168.21/231.91 = 112.83/x
  3. Step 3: Cross multiply
    168.21x = 231.91 × 112.83
  4. Step 4: Simplify right side
    168.21x = 26,165.89
  5. Step 5: Solve for x
    x = 26,165.89/168.21
  6. Step 6: Final answer
    x = 155.55

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.