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Finding the Fourth Proportional to 131.20, 195.79 and 115.81

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Solution

The fourth proportional to 131.20, 195.79 and 115.81 is: 172.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    131.20 : 195.79 = 115.81 : x
  2. Step 2: Convert to fraction form
    131.20/195.79 = 115.81/x
  3. Step 3: Cross multiply
    131.20x = 195.79 × 115.81
  4. Step 4: Simplify right side
    131.20x = 22,674.44
  5. Step 5: Solve for x
    x = 22,674.44/131.20
  6. Step 6: Final answer
    x = 172.82

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.