Home / 2,807.82-4,212-859.68

Finding the Fourth Proportional to 2,807.82, 4,212 and 859.68

Calculator

Solution

The fourth proportional to 2,807.82, 4,212 and 859.68 is: 1,289.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,807.82 : 4,212 = 859.68 : x
  2. Step 2: Convert to fraction form
    2,807.82/4,212 = 859.68/x
  3. Step 3: Cross multiply
    2,807.82x = 4,212 × 859.68
  4. Step 4: Simplify right side
    2,807.82x = 3,620,972.16
  5. Step 5: Solve for x
    x = 3,620,972.16/2,807.82
  6. Step 6: Final answer
    x = 1,289.60

Related Problems

Find fourth proportional to 1,403.91, 2,106 and 429.84
Half scale
Find fourth proportional to 5,615.64, 8,424 and 1,719.36
Double scale
Find fourth proportional to 2,808.82, 4,213.50 and 860.68
Similar ratio
Find fourth proportional to 4,211.73, 6,318 and 1,289.52
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.