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Finding the Fourth Proportional to 2,661.89, 3,992.84 and 813.02

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Solution

The fourth proportional to 2,661.89, 3,992.84 and 813.02 is: 1,219.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,661.89 : 3,992.84 = 813.02 : x
  2. Step 2: Convert to fraction form
    2,661.89/3,992.84 = 813.02/x
  3. Step 3: Cross multiply
    2,661.89x = 3,992.84 × 813.02
  4. Step 4: Simplify right side
    2,661.89x = 3,246,234.75
  5. Step 5: Solve for x
    x = 3,246,234.75/2,661.89
  6. Step 6: Final answer
    x = 1,219.52

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1.5x scale

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.