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Finding the Fourth Proportional to 2,100.39, 3,149.67 and 639.20

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Solution

The fourth proportional to 2,100.39, 3,149.67 and 639.20 is: 958.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.39 : 3,149.67 = 639.20 : x
  2. Step 2: Convert to fraction form
    2,100.39/3,149.67 = 639.20/x
  3. Step 3: Cross multiply
    2,100.39x = 3,149.67 × 639.20
  4. Step 4: Simplify right side
    2,100.39x = 2,013,265.87
  5. Step 5: Solve for x
    x = 2,013,265.87/2,100.39
  6. Step 6: Final answer
    x = 958.52

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1.5x scale

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.