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Finding the Fourth Proportional to 3,940.55, 5,905.36 and 1,990.47

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Solution

The fourth proportional to 3,940.55, 5,905.36 and 1,990.47 is: 2,982.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,940.55 : 5,905.36 = 1,990.47 : x
  2. Step 2: Convert to fraction form
    3,940.55/5,905.36 = 1,990.47/x
  3. Step 3: Cross multiply
    3,940.55x = 5,905.36 × 1,990.47
  4. Step 4: Simplify right side
    3,940.55x = 11,754,455.36
  5. Step 5: Solve for x
    x = 11,754,455.36/3,940.55
  6. Step 6: Final answer
    x = 2,982.95

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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.