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Finding the Fourth Proportional to 2,611.91, 3,917.85 and 664.11

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Solution

The fourth proportional to 2,611.91, 3,917.85 and 664.11 is: 996.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,611.91 : 3,917.85 = 664.11 : x
  2. Step 2: Convert to fraction form
    2,611.91/3,917.85 = 664.11/x
  3. Step 3: Cross multiply
    2,611.91x = 3,917.85 × 664.11
  4. Step 4: Simplify right side
    2,611.91x = 2,601,880.87
  5. Step 5: Solve for x
    x = 2,601,880.87/2,611.91
  6. Step 6: Final answer
    x = 996.16

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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.