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Finding the Fourth Proportional to 2,660.40, 3,990.96 and 1,199.88

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Solution

The fourth proportional to 2,660.40, 3,990.96 and 1,199.88 is: 1,799.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,660.40 : 3,990.96 = 1,199.88 : x
  2. Step 2: Convert to fraction form
    2,660.40/3,990.96 = 1,199.88/x
  3. Step 3: Cross multiply
    2,660.40x = 3,990.96 × 1,199.88
  4. Step 4: Simplify right side
    2,660.40x = 4,788,673.08
  5. Step 5: Solve for x
    x = 4,788,673.08/2,660.40
  6. Step 6: Final answer
    x = 1,799.98

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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.