Home / 3,989.84-5,507.40-2,871.44

Finding the Fourth Proportional to 3,989.84, 5,507.40 and 2,871.44

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Solution

The fourth proportional to 3,989.84, 5,507.40 and 2,871.44 is: 3,963.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.84 : 5,507.40 = 2,871.44 : x
  2. Step 2: Convert to fraction form
    3,989.84/5,507.40 = 2,871.44/x
  3. Step 3: Cross multiply
    3,989.84x = 5,507.40 × 2,871.44
  4. Step 4: Simplify right side
    3,989.84x = 15,814,168.66
  5. Step 5: Solve for x
    x = 15,814,168.66/3,989.84
  6. Step 6: Final answer
    x = 3,963.61

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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.