Home / 3,990.80-5,507.16-2,222.36

Finding the Fourth Proportional to 3,990.80, 5,507.16 and 2,222.36

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Solution

The fourth proportional to 3,990.80, 5,507.16 and 2,222.36 is: 3,066.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,990.80 : 5,507.16 = 2,222.36 : x
  2. Step 2: Convert to fraction form
    3,990.80/5,507.16 = 2,222.36/x
  3. Step 3: Cross multiply
    3,990.80x = 5,507.16 × 2,222.36
  4. Step 4: Simplify right side
    3,990.80x = 12,238,892.10
  5. Step 5: Solve for x
    x = 12,238,892.10/3,990.80
  6. Step 6: Final answer
    x = 3,066.78

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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.