Home / 3,989.28-5,979.69-1,904.88

Finding the Fourth Proportional to 3,989.28, 5,979.69 and 1,904.88

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Solution

The fourth proportional to 3,989.28, 5,979.69 and 1,904.88 is: 2,855.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,989.28 : 5,979.69 = 1,904.88 : x
  2. Step 2: Convert to fraction form
    3,989.28/5,979.69 = 1,904.88/x
  3. Step 3: Cross multiply
    3,989.28x = 5,979.69 × 1,904.88
  4. Step 4: Simplify right side
    3,989.28x = 11,390,581.05
  5. Step 5: Solve for x
    x = 11,390,581.05/3,989.28
  6. Step 6: Final answer
    x = 2,855.30

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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.