Home / 3,889.10-5,366.94-2,120.81

Finding the Fourth Proportional to 3,889.10, 5,366.94 and 2,120.81

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Solution

The fourth proportional to 3,889.10, 5,366.94 and 2,120.81 is: 2,926.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,889.10 : 5,366.94 = 2,120.81 : x
  2. Step 2: Convert to fraction form
    3,889.10/5,366.94 = 2,120.81/x
  3. Step 3: Cross multiply
    3,889.10x = 5,366.94 × 2,120.81
  4. Step 4: Simplify right side
    3,889.10x = 11,382,233.19
  5. Step 5: Solve for x
    x = 11,382,233.19/3,889.10
  6. Step 6: Final answer
    x = 2,926.70

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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.