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Finding the Fourth Proportional to 131.05, 196.40 and 53.92

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Solution

The fourth proportional to 131.05, 196.40 and 53.92 is: 80.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.05 : 196.40 = 53.92 : x
  2. Step 2: Convert to fraction form
    131.05/196.40 = 53.92/x
  3. Step 3: Cross multiply
    131.05x = 196.40 × 53.92
  4. Step 4: Simplify right side
    131.05x = 10,589.84
  5. Step 5: Solve for x
    x = 10,589.84/131.05
  6. Step 6: Final answer
    x = 80.81

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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.