Home / 2,100.20-3,149.96-639.26

Finding the Fourth Proportional to 2,100.20, 3,149.96 and 639.26

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Solution

The fourth proportional to 2,100.20, 3,149.96 and 639.26 is: 958.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.20 : 3,149.96 = 639.26 : x
  2. Step 2: Convert to fraction form
    2,100.20/3,149.96 = 639.26/x
  3. Step 3: Cross multiply
    2,100.20x = 3,149.96 × 639.26
  4. Step 4: Simplify right side
    2,100.20x = 2,013,643.43
  5. Step 5: Solve for x
    x = 2,013,643.43/2,100.20
  6. Step 6: Final answer
    x = 958.79

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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.