Home / 2,120.39-3,180.61-581.39

Finding the Fourth Proportional to 2,120.39, 3,180.61 and 581.39

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Solution

The fourth proportional to 2,120.39, 3,180.61 and 581.39 is: 872.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.39 : 3,180.61 = 581.39 : x
  2. Step 2: Convert to fraction form
    2,120.39/3,180.61 = 581.39/x
  3. Step 3: Cross multiply
    2,120.39x = 3,180.61 × 581.39
  4. Step 4: Simplify right side
    2,120.39x = 1,849,174.85
  5. Step 5: Solve for x
    x = 1,849,174.85/2,120.39
  6. Step 6: Final answer
    x = 872.09

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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.