Home / 2,100.12-3,149.97-640.29

Finding the Fourth Proportional to 2,100.12, 3,149.97 and 640.29

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Solution

The fourth proportional to 2,100.12, 3,149.97 and 640.29 is: 960.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.12 : 3,149.97 = 640.29 : x
  2. Step 2: Convert to fraction form
    2,100.12/3,149.97 = 640.29/x
  3. Step 3: Cross multiply
    2,100.12x = 3,149.97 × 640.29
  4. Step 4: Simplify right side
    2,100.12x = 2,016,894.29
  5. Step 5: Solve for x
    x = 2,016,894.29/2,100.12
  6. Step 6: Final answer
    x = 960.37

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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.