Home / 2,608-3,912-784

Finding the Fourth Proportional to 2,608, 3,912 and 784

Calculator

Solution

The fourth proportional to 2,608, 3,912 and 784 is: 1,176

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,608 : 3,912 = 784 : x
  2. Step 2: Convert to fraction form
    2,608/3,912 = 784/x
  3. Step 3: Cross multiply
    2,608x = 3,912 × 784
  4. Step 4: Simplify right side
    2,608x = 3,067,008
  5. Step 5: Solve for x
    x = 3,067,008/2,608
  6. Step 6: Final answer
    x = 1,176

Related Problems

Find fourth proportional to 1,304, 1,956 and 392
Half scale
Find fourth proportional to 5,216, 7,824 and 1,568
Double scale
Find fourth proportional to 2,609, 3,913.50 and 785
Similar ratio
Find fourth proportional to 3,912, 5,868 and 1,176
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.