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Finding the Fourth Proportional to 168.12, 231.95 and 98.16

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Solution

The fourth proportional to 168.12, 231.95 and 98.16 is: 135.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    168.12 : 231.95 = 98.16 : x
  2. Step 2: Convert to fraction form
    168.12/231.95 = 98.16/x
  3. Step 3: Cross multiply
    168.12x = 231.95 × 98.16
  4. Step 4: Simplify right side
    168.12x = 22,767.72
  5. Step 5: Solve for x
    x = 22,767.72/168.12
  6. Step 6: Final answer
    x = 135.43

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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.