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Finding the Fourth Proportional to 3,989.42, 5,984.99 and 1,216.02

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Solution

The fourth proportional to 3,989.42, 5,984.99 and 1,216.02 is: 1,824.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.42 : 5,984.99 = 1,216.02 : x
  2. Step 2: Convert to fraction form
    3,989.42/5,984.99 = 1,216.02/x
  3. Step 3: Cross multiply
    3,989.42x = 5,984.99 × 1,216.02
  4. Step 4: Simplify right side
    3,989.42x = 7,277,837.61
  5. Step 5: Solve for x
    x = 7,277,837.61/3,989.42
  6. Step 6: Final answer
    x = 1,824.29

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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.