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Finding the Fourth Proportional to 3,993.39, 5,989.70 and 1,220.72

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Solution

The fourth proportional to 3,993.39, 5,989.70 and 1,220.72 is: 1,830.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,993.39 : 5,989.70 = 1,220.72 : x
  2. Step 2: Convert to fraction form
    3,993.39/5,989.70 = 1,220.72/x
  3. Step 3: Cross multiply
    3,993.39x = 5,989.70 × 1,220.72
  4. Step 4: Simplify right side
    3,993.39x = 7,311,710.53
  5. Step 5: Solve for x
    x = 7,311,710.53/3,993.39
  6. Step 6: Final answer
    x = 1,830.95

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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.