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Finding the Fourth Proportional to 1,998.72, 2,757.60 and 1,378.08

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Solution

The fourth proportional to 1,998.72, 2,757.60 and 1,378.08 is: 1,901.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.72 : 2,757.60 = 1,378.08 : x
  2. Step 2: Convert to fraction form
    1,998.72/2,757.60 = 1,378.08/x
  3. Step 3: Cross multiply
    1,998.72x = 2,757.60 × 1,378.08
  4. Step 4: Simplify right side
    1,998.72x = 3,800,193.41
  5. Step 5: Solve for x
    x = 3,800,193.41/1,998.72
  6. Step 6: Final answer
    x = 1,901.31

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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.