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Finding the Fourth Proportional to 3,993.60, 5,979.60 and 3,122.40

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Solution

The fourth proportional to 3,993.60, 5,979.60 and 3,122.40 is: 4,675.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,993.60 : 5,979.60 = 3,122.40 : x
  2. Step 2: Convert to fraction form
    3,993.60/5,979.60 = 3,122.40/x
  3. Step 3: Cross multiply
    3,993.60x = 5,979.60 × 3,122.40
  4. Step 4: Simplify right side
    3,993.60x = 18,670,703.04
  5. Step 5: Solve for x
    x = 18,670,703.04/3,993.60
  6. Step 6: Final answer
    x = 4,675.16

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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.