Home / 3,109.80-4,659.90-2,620.20

Finding the Fourth Proportional to 3,109.80, 4,659.90 and 2,620.20

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Solution

The fourth proportional to 3,109.80, 4,659.90 and 2,620.20 is: 3,926.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.80 : 4,659.90 = 2,620.20 : x
  2. Step 2: Convert to fraction form
    3,109.80/4,659.90 = 2,620.20/x
  3. Step 3: Cross multiply
    3,109.80x = 4,659.90 × 2,620.20
  4. Step 4: Simplify right side
    3,109.80x = 12,209,869.98
  5. Step 5: Solve for x
    x = 12,209,869.98/3,109.80
  6. Step 6: Final answer
    x = 3,926.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.