Home / 2,120.31-3,180.87-659.07

Finding the Fourth Proportional to 2,120.31, 3,180.87 and 659.07

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Solution

The fourth proportional to 2,120.31, 3,180.87 and 659.07 is: 988.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.31 : 3,180.87 = 659.07 : x
  2. Step 2: Convert to fraction form
    2,120.31/3,180.87 = 659.07/x
  3. Step 3: Cross multiply
    2,120.31x = 3,180.87 × 659.07
  4. Step 4: Simplify right side
    2,120.31x = 2,096,415.99
  5. Step 5: Solve for x
    x = 2,096,415.99/2,120.31
  6. Step 6: Final answer
    x = 988.73

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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.