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Finding the Fourth Proportional to 7.87, 11.81 and 3.37

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Solution

The fourth proportional to 7.87, 11.81 and 3.37 is: 5.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    7.87 : 11.81 = 3.37 : x
  2. Step 2: Convert to fraction form
    7.87/11.81 = 3.37/x
  3. Step 3: Cross multiply
    7.87x = 11.81 × 3.37
  4. Step 4: Simplify right side
    7.87x = 39.80
  5. Step 5: Solve for x
    x = 39.80/7.87
  6. Step 6: Final answer
    x = 5.06

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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.