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Finding the Fourth Proportional to 2,661.90, 3,993.03 and 813.17

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Solution

The fourth proportional to 2,661.90, 3,993.03 and 813.17 is: 1,219.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.90 : 3,993.03 = 813.17 : x
  2. Step 2: Convert to fraction form
    2,661.90/3,993.03 = 813.17/x
  3. Step 3: Cross multiply
    2,661.90x = 3,993.03 × 813.17
  4. Step 4: Simplify right side
    2,661.90x = 3,246,992.24
  5. Step 5: Solve for x
    x = 3,246,992.24/2,661.90
  6. Step 6: Final answer
    x = 1,219.80

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.