Home / 2,120.20-3,180.72-659.41

Finding the Fourth Proportional to 2,120.20, 3,180.72 and 659.41

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Solution

The fourth proportional to 2,120.20, 3,180.72 and 659.41 is: 989.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.20 : 3,180.72 = 659.41 : x
  2. Step 2: Convert to fraction form
    2,120.20/3,180.72 = 659.41/x
  3. Step 3: Cross multiply
    2,120.20x = 3,180.72 × 659.41
  4. Step 4: Simplify right side
    2,120.20x = 2,097,393.10
  5. Step 5: Solve for x
    x = 2,097,393.10/2,120.20
  6. Step 6: Final answer
    x = 989.24

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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.