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Finding the Fourth Proportional to 2,188.96, 3,282.48 and 820

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Solution

The fourth proportional to 2,188.96, 3,282.48 and 820 is: 1,229.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,188.96 : 3,282.48 = 820 : x
  2. Step 2: Convert to fraction form
    2,188.96/3,282.48 = 820/x
  3. Step 3: Cross multiply
    2,188.96x = 3,282.48 × 820
  4. Step 4: Simplify right side
    2,188.96x = 2,691,633.60
  5. Step 5: Solve for x
    x = 2,691,633.60/2,188.96
  6. Step 6: Final answer
    x = 1,229.64

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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.