Home / 4,979.70-6,871.61-2,855.21

Finding the Fourth Proportional to 4,979.70, 6,871.61 and 2,855.21

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Solution

The fourth proportional to 4,979.70, 6,871.61 and 2,855.21 is: 3,939.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,979.70 : 6,871.61 = 2,855.21 : x
  2. Step 2: Convert to fraction form
    4,979.70/6,871.61 = 2,855.21/x
  3. Step 3: Cross multiply
    4,979.70x = 6,871.61 × 2,855.21
  4. Step 4: Simplify right side
    4,979.70x = 19,619,889.59
  5. Step 5: Solve for x
    x = 19,619,889.59/4,979.70
  6. Step 6: Final answer
    x = 3,939.97

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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.