Home / 3,979.30-5,491.20-2,210.80

Finding the Fourth Proportional to 3,979.30, 5,491.20 and 2,210.80

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Solution

The fourth proportional to 3,979.30, 5,491.20 and 2,210.80 is: 3,050.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,979.30 : 5,491.20 = 2,210.80 : x
  2. Step 2: Convert to fraction form
    3,979.30/5,491.20 = 2,210.80/x
  3. Step 3: Cross multiply
    3,979.30x = 5,491.20 × 2,210.80
  4. Step 4: Simplify right side
    3,979.30x = 12,139,944.96
  5. Step 5: Solve for x
    x = 12,139,944.96/3,979.30
  6. Step 6: Final answer
    x = 3,050.77

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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.