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Finding the Fourth Proportional to 131.20, 196.68 and 108.56

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Solution

The fourth proportional to 131.20, 196.68 and 108.56 is: 162.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.20 : 196.68 = 108.56 : x
  2. Step 2: Convert to fraction form
    131.20/196.68 = 108.56/x
  3. Step 3: Cross multiply
    131.20x = 196.68 × 108.56
  4. Step 4: Simplify right side
    131.20x = 21,351.58
  5. Step 5: Solve for x
    x = 21,351.58/131.20
  6. Step 6: Final answer
    x = 162.74

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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.