Home / 3,990.75-5,507.40-2,222.31

Finding the Fourth Proportional to 3,990.75, 5,507.40 and 2,222.31

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Solution

The fourth proportional to 3,990.75, 5,507.40 and 2,222.31 is: 3,066.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.75 : 5,507.40 = 2,222.31 : x
  2. Step 2: Convert to fraction form
    3,990.75/5,507.40 = 2,222.31/x
  3. Step 3: Cross multiply
    3,990.75x = 5,507.40 × 2,222.31
  4. Step 4: Simplify right side
    3,990.75x = 12,239,150.09
  5. Step 5: Solve for x
    x = 12,239,150.09/3,990.75
  6. Step 6: Final answer
    x = 3,066.88

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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.