Home / 8,478-12,722.40-3,861

Finding the Fourth Proportional to 8,478, 12,722.40 and 3,861

Calculator

Solution

The fourth proportional to 8,478, 12,722.40 and 3,861 is: 5,793.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,478 : 12,722.40 = 3,861 : x
  2. Step 2: Convert to fraction form
    8,478/12,722.40 = 3,861/x
  3. Step 3: Cross multiply
    8,478x = 12,722.40 × 3,861
  4. Step 4: Simplify right side
    8,478x = 49,121,186.40
  5. Step 5: Solve for x
    x = 49,121,186.40/8,478
  6. Step 6: Final answer
    x = 5,793.96

Related Problems

Find fourth proportional to 4,239, 6,361.20 and 1,930.50
Half scale
Find fourth proportional to 16,956, 25,444.80 and 7,722
Double scale
Find fourth proportional to 8,479, 12,723.90 and 3,862
Similar ratio
Find fourth proportional to 12,717, 19,083.60 and 5,791.50
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.