Home / 3,139.80-4,309.81-2,777.80

Finding the Fourth Proportional to 3,139.80, 4,309.81 and 2,777.80

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Solution

The fourth proportional to 3,139.80, 4,309.81 and 2,777.80 is: 3,812.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,139.80 : 4,309.81 = 2,777.80 : x
  2. Step 2: Convert to fraction form
    3,139.80/4,309.81 = 2,777.80/x
  3. Step 3: Cross multiply
    3,139.80x = 4,309.81 × 2,777.80
  4. Step 4: Simplify right side
    3,139.80x = 11,971,790.22
  5. Step 5: Solve for x
    x = 11,971,790.22/3,139.80
  6. Step 6: Final answer
    x = 3,812.91

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.