Home / 3,989.12-5,982.36-1,215.44

Finding the Fourth Proportional to 3,989.12, 5,982.36 and 1,215.44

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Solution

The fourth proportional to 3,989.12, 5,982.36 and 1,215.44 is: 1,822.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.12 : 5,982.36 = 1,215.44 : x
  2. Step 2: Convert to fraction form
    3,989.12/5,982.36 = 1,215.44/x
  3. Step 3: Cross multiply
    3,989.12x = 5,982.36 × 1,215.44
  4. Step 4: Simplify right side
    3,989.12x = 7,271,199.64
  5. Step 5: Solve for x
    x = 7,271,199.64/3,989.12
  6. Step 6: Final answer
    x = 1,822.76

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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.