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Finding the Fourth Proportional to 2,690.73, 3,713.21 and 1,511.80

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Solution

The fourth proportional to 2,690.73, 3,713.21 and 1,511.80 is: 2,086.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,690.73 : 3,713.21 = 1,511.80 : x
  2. Step 2: Convert to fraction form
    2,690.73/3,713.21 = 1,511.80/x
  3. Step 3: Cross multiply
    2,690.73x = 3,713.21 × 1,511.80
  4. Step 4: Simplify right side
    2,690.73x = 5,613,630.88
  5. Step 5: Solve for x
    x = 5,613,630.88/2,690.73
  6. Step 6: Final answer
    x = 2,086.29

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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.