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Finding the Fourth Proportional to 3,989.61, 5,982.05 and 1,356.17

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Solution

The fourth proportional to 3,989.61, 5,982.05 and 1,356.17 is: 2,033.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.61 : 5,982.05 = 1,356.17 : x
  2. Step 2: Convert to fraction form
    3,989.61/5,982.05 = 1,356.17/x
  3. Step 3: Cross multiply
    3,989.61x = 5,982.05 × 1,356.17
  4. Step 4: Simplify right side
    3,989.61x = 8,112,650.23
  5. Step 5: Solve for x
    x = 8,112,650.23/3,989.61
  6. Step 6: Final answer
    x = 2,033.44

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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.