Home / 3,428.60-5,139.70-2,687.80

Finding the Fourth Proportional to 3,428.60, 5,139.70 and 2,687.80

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Solution

The fourth proportional to 3,428.60, 5,139.70 and 2,687.80 is: 4,029.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,428.60 : 5,139.70 = 2,687.80 : x
  2. Step 2: Convert to fraction form
    3,428.60/5,139.70 = 2,687.80/x
  3. Step 3: Cross multiply
    3,428.60x = 5,139.70 × 2,687.80
  4. Step 4: Simplify right side
    3,428.60x = 13,814,485.66
  5. Step 5: Solve for x
    x = 13,814,485.66/3,428.60
  6. Step 6: Final answer
    x = 4,029.19

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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.