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Finding the Fourth Proportional to 1,998.41, 2,759.94 and 1,521.20

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Solution

The fourth proportional to 1,998.41, 2,759.94 and 1,521.20 is: 2,100.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,998.41 : 2,759.94 = 1,521.20 : x
  2. Step 2: Convert to fraction form
    1,998.41/2,759.94 = 1,521.20/x
  3. Step 3: Cross multiply
    1,998.41x = 2,759.94 × 1,521.20
  4. Step 4: Simplify right side
    1,998.41x = 4,198,427.63
  5. Step 5: Solve for x
    x = 4,198,427.63/1,998.41
  6. Step 6: Final answer
    x = 2,100.89

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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.