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Finding the Fourth Proportional to 2,205.15, 3,305.62 and 818.12

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Solution

The fourth proportional to 2,205.15, 3,305.62 and 818.12 is: 1,226.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,205.15 : 3,305.62 = 818.12 : x
  2. Step 2: Convert to fraction form
    2,205.15/3,305.62 = 818.12/x
  3. Step 3: Cross multiply
    2,205.15x = 3,305.62 × 818.12
  4. Step 4: Simplify right side
    2,205.15x = 2,704,393.83
  5. Step 5: Solve for x
    x = 2,704,393.83/2,205.15
  6. Step 6: Final answer
    x = 1,226.40

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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.