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Finding the Fourth Proportional to 2,120.00, 3,179.39 and 639.16

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Solution

The fourth proportional to 2,120.00, 3,179.39 and 639.16 is: 958.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,120.00 : 3,179.39 = 639.16 : x
  2. Step 2: Convert to fraction form
    2,120.00/3,179.39 = 639.16/x
  3. Step 3: Cross multiply
    2,120.00x = 3,179.39 × 639.16
  4. Step 4: Simplify right side
    2,120.00x = 2,032,127.77
  5. Step 5: Solve for x
    x = 2,032,127.77/2,120.00
  6. Step 6: Final answer
    x = 958.55

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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.