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Finding the Fourth Proportional to 3,989.73, 5,982.78 and 1,216.74

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Solution

The fourth proportional to 3,989.73, 5,982.78 and 1,216.74 is: 1,824.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.73 : 5,982.78 = 1,216.74 : x
  2. Step 2: Convert to fraction form
    3,989.73/5,982.78 = 1,216.74/x
  3. Step 3: Cross multiply
    3,989.73x = 5,982.78 × 1,216.74
  4. Step 4: Simplify right side
    3,989.73x = 7,279,487.74
  5. Step 5: Solve for x
    x = 7,279,487.74/3,989.73
  6. Step 6: Final answer
    x = 1,824.56

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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.