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Finding the Fourth Proportional to 1,998.63, 2,755.62 and 1,289.25

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Solution

The fourth proportional to 1,998.63, 2,755.62 and 1,289.25 is: 1,777.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.63 : 2,755.62 = 1,289.25 : x
  2. Step 2: Convert to fraction form
    1,998.63/2,755.62 = 1,289.25/x
  3. Step 3: Cross multiply
    1,998.63x = 2,755.62 × 1,289.25
  4. Step 4: Simplify right side
    1,998.63x = 3,552,683.09
  5. Step 5: Solve for x
    x = 3,552,683.09/1,998.63
  6. Step 6: Final answer
    x = 1,777.56

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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.