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Finding the Fourth Proportional to 2,112.86, 3,169.84 and 813.90

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Solution

The fourth proportional to 2,112.86, 3,169.84 and 813.90 is: 1,221.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,112.86 : 3,169.84 = 813.90 : x
  2. Step 2: Convert to fraction form
    2,112.86/3,169.84 = 813.90/x
  3. Step 3: Cross multiply
    2,112.86x = 3,169.84 × 813.90
  4. Step 4: Simplify right side
    2,112.86x = 2,579,932.78
  5. Step 5: Solve for x
    x = 2,579,932.78/2,112.86
  6. Step 6: Final answer
    x = 1,221.06

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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.