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Finding the Fourth Proportional to 2,660, 3,990.64 and 1,199.15

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Solution

The fourth proportional to 2,660, 3,990.64 and 1,199.15 is: 1,799.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660 : 3,990.64 = 1,199.15 : x
  2. Step 2: Convert to fraction form
    2,660/3,990.64 = 1,199.15/x
  3. Step 3: Cross multiply
    2,660x = 3,990.64 × 1,199.15
  4. Step 4: Simplify right side
    2,660x = 4,785,375.96
  5. Step 5: Solve for x
    x = 4,785,375.96/2,660
  6. Step 6: Final answer
    x = 1,799.01

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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.