Home / 6,385.44-8,809.20-3,900

Finding the Fourth Proportional to 6,385.44, 8,809.20 and 3,900

Calculator

Solution

The fourth proportional to 6,385.44, 8,809.20 and 3,900 is: 5,380.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    6,385.44 : 8,809.20 = 3,900 : x
  2. Step 2: Convert to fraction form
    6,385.44/8,809.20 = 3,900/x
  3. Step 3: Cross multiply
    6,385.44x = 8,809.20 × 3,900
  4. Step 4: Simplify right side
    6,385.44x = 34,355,880
  5. Step 5: Solve for x
    x = 34,355,880/6,385.44
  6. Step 6: Final answer
    x = 5,380.35

Related Problems

Find fourth proportional to 3,192.72, 4,404.60 and 1,950
Half scale
Find fourth proportional to 12,770.88, 17,618.40 and 7,800
Double scale
Find fourth proportional to 6,386.44, 8,810.58 and 3,901
Similar ratio
Find fourth proportional to 9,578.16, 13,213.80 and 5,850
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.