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Finding the Fourth Proportional to 1,990.77, 2,745.99 and 1,283.52

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Solution

The fourth proportional to 1,990.77, 2,745.99 and 1,283.52 is: 1,770.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,990.77 : 2,745.99 = 1,283.52 : x
  2. Step 2: Convert to fraction form
    1,990.77/2,745.99 = 1,283.52/x
  3. Step 3: Cross multiply
    1,990.77x = 2,745.99 × 1,283.52
  4. Step 4: Simplify right side
    1,990.77x = 3,524,533.08
  5. Step 5: Solve for x
    x = 3,524,533.08/1,990.77
  6. Step 6: Final answer
    x = 1,770.44

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.