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Finding the Fourth Proportional to 1,998.55, 2,755.03 and 1,290.34

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Solution

The fourth proportional to 1,998.55, 2,755.03 and 1,290.34 is: 1,778.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.55 : 2,755.03 = 1,290.34 : x
  2. Step 2: Convert to fraction form
    1,998.55/2,755.03 = 1,290.34/x
  3. Step 3: Cross multiply
    1,998.55x = 2,755.03 × 1,290.34
  4. Step 4: Simplify right side
    1,998.55x = 3,554,911.64
  5. Step 5: Solve for x
    x = 3,554,911.64/1,998.55
  6. Step 6: Final answer
    x = 1,778.75

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1.5x scale

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.