Home / 1,988.82-2,745.81-1,280.95

Finding the Fourth Proportional to 1,988.82, 2,745.81 and 1,280.95

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Solution

The fourth proportional to 1,988.82, 2,745.81 and 1,280.95 is: 1,768.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.82 : 2,745.81 = 1,280.95 : x
  2. Step 2: Convert to fraction form
    1,988.82/2,745.81 = 1,280.95/x
  3. Step 3: Cross multiply
    1,988.82x = 2,745.81 × 1,280.95
  4. Step 4: Simplify right side
    1,988.82x = 3,517,238.45
  5. Step 5: Solve for x
    x = 3,517,238.45/1,988.82
  6. Step 6: Final answer
    x = 1,768.51

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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.