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Finding the Fourth Proportional to 4,780, 7,172.43 and 2,183.55

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Solution

The fourth proportional to 4,780, 7,172.43 and 2,183.55 is: 3,276.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,780 : 7,172.43 = 2,183.55 : x
  2. Step 2: Convert to fraction form
    4,780/7,172.43 = 2,183.55/x
  3. Step 3: Cross multiply
    4,780x = 7,172.43 × 2,183.55
  4. Step 4: Simplify right side
    4,780x = 15,661,359.53
  5. Step 5: Solve for x
    x = 15,661,359.53/4,780
  6. Step 6: Final answer
    x = 3,276.44

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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.