Home / 3,900.12-5,382.48-2,221.56

Finding the Fourth Proportional to 3,900.12, 5,382.48 and 2,221.56

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Solution

The fourth proportional to 3,900.12, 5,382.48 and 2,221.56 is: 3,065.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.12 : 5,382.48 = 2,221.56 : x
  2. Step 2: Convert to fraction form
    3,900.12/5,382.48 = 2,221.56/x
  3. Step 3: Cross multiply
    3,900.12x = 5,382.48 × 2,221.56
  4. Step 4: Simplify right side
    3,900.12x = 11,957,502.27
  5. Step 5: Solve for x
    x = 11,957,502.27/3,900.12
  6. Step 6: Final answer
    x = 3,065.93

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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.