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Finding the Fourth Proportional to 2,662.80, 3,989.40 and 2,173.20

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Solution

The fourth proportional to 2,662.80, 3,989.40 and 2,173.20 is: 3,255.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,662.80 : 3,989.40 = 2,173.20 : x
  2. Step 2: Convert to fraction form
    2,662.80/3,989.40 = 2,173.20/x
  3. Step 3: Cross multiply
    2,662.80x = 3,989.40 × 2,173.20
  4. Step 4: Simplify right side
    2,662.80x = 8,669,764.08
  5. Step 5: Solve for x
    x = 8,669,764.08/2,662.80
  6. Step 6: Final answer
    x = 3,255.88

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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.