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Finding the Fourth Proportional to 3,221.65, 4,823.83 and 1,921.33

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Solution

The fourth proportional to 3,221.65, 4,823.83 and 1,921.33 is: 2,876.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,221.65 : 4,823.83 = 1,921.33 : x
  2. Step 2: Convert to fraction form
    3,221.65/4,823.83 = 1,921.33/x
  3. Step 3: Cross multiply
    3,221.65x = 4,823.83 × 1,921.33
  4. Step 4: Simplify right side
    3,221.65x = 9,268,169.29
  5. Step 5: Solve for x
    x = 9,268,169.29/3,221.65
  6. Step 6: Final answer
    x = 2,876.84

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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.