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Finding the Fourth Proportional to 1,988.94, 2,745.05 and 1,889.79

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Solution

The fourth proportional to 1,988.94, 2,745.05 and 1,889.79 is: 2,608.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,988.94 : 2,745.05 = 1,889.79 : x
  2. Step 2: Convert to fraction form
    1,988.94/2,745.05 = 1,889.79/x
  3. Step 3: Cross multiply
    1,988.94x = 2,745.05 × 1,889.79
  4. Step 4: Simplify right side
    1,988.94x = 5,187,568.04
  5. Step 5: Solve for x
    x = 5,187,568.04/1,988.94
  6. Step 6: Final answer
    x = 2,608.21

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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.