Home / 3,899.21-5,387.78-2,889.47

Finding the Fourth Proportional to 3,899.21, 5,387.78 and 2,889.47

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Solution

The fourth proportional to 3,899.21, 5,387.78 and 2,889.47 is: 3,992.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,899.21 : 5,387.78 = 2,889.47 : x
  2. Step 2: Convert to fraction form
    3,899.21/5,387.78 = 2,889.47/x
  3. Step 3: Cross multiply
    3,899.21x = 5,387.78 × 2,889.47
  4. Step 4: Simplify right side
    3,899.21x = 15,567,808.96
  5. Step 5: Solve for x
    x = 15,567,808.96/3,899.21
  6. Step 6: Final answer
    x = 3,992.56

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1.5x scale

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.