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Finding the Fourth Proportional to 131.94, 198 and 83.88

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Solution

The fourth proportional to 131.94, 198 and 83.88 is: 125.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.94 : 198 = 83.88 : x
  2. Step 2: Convert to fraction form
    131.94/198 = 83.88/x
  3. Step 3: Cross multiply
    131.94x = 198 × 83.88
  4. Step 4: Simplify right side
    131.94x = 16,608.24
  5. Step 5: Solve for x
    x = 16,608.24/131.94
  6. Step 6: Final answer
    x = 125.88

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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.