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Finding the Fourth Proportional to 3,990.99, 5,500.39 and 3,247.41

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Solution

The fourth proportional to 3,990.99, 5,500.39 and 3,247.41 is: 4,475.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.99 : 5,500.39 = 3,247.41 : x
  2. Step 2: Convert to fraction form
    3,990.99/5,500.39 = 3,247.41/x
  3. Step 3: Cross multiply
    3,990.99x = 5,500.39 × 3,247.41
  4. Step 4: Simplify right side
    3,990.99x = 17,862,021.49
  5. Step 5: Solve for x
    x = 17,862,021.49/3,990.99
  6. Step 6: Final answer
    x = 4,475.59

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.