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Finding the Fourth Proportional to 2,653.80, 3,980.50 and 1,072.62

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Solution

The fourth proportional to 2,653.80, 3,980.50 and 1,072.62 is: 1,608.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,653.80 : 3,980.50 = 1,072.62 : x
  2. Step 2: Convert to fraction form
    2,653.80/3,980.50 = 1,072.62/x
  3. Step 3: Cross multiply
    2,653.80x = 3,980.50 × 1,072.62
  4. Step 4: Simplify right side
    2,653.80x = 4,269,563.91
  5. Step 5: Solve for x
    x = 4,269,563.91/2,653.80
  6. Step 6: Final answer
    x = 1,608.85

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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.