Home / 3,990.39-5,984.37-1,909.31

Finding the Fourth Proportional to 3,990.39, 5,984.37 and 1,909.31

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Solution

The fourth proportional to 3,990.39, 5,984.37 and 1,909.31 is: 2,863.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.39 : 5,984.37 = 1,909.31 : x
  2. Step 2: Convert to fraction form
    3,990.39/5,984.37 = 1,909.31/x
  3. Step 3: Cross multiply
    3,990.39x = 5,984.37 × 1,909.31
  4. Step 4: Simplify right side
    3,990.39x = 11,425,987.56
  5. Step 5: Solve for x
    x = 11,425,987.56/3,990.39
  6. Step 6: Final answer
    x = 2,863.38

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1.5x scale

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.