Home / 1,200-1,800-516.48

Finding the Fourth Proportional to 1,200, 1,800 and 516.48

Calculator

Solution

The fourth proportional to 1,200, 1,800 and 516.48 is: 774.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,200 : 1,800 = 516.48 : x
  2. Step 2: Convert to fraction form
    1,200/1,800 = 516.48/x
  3. Step 3: Cross multiply
    1,200x = 1,800 × 516.48
  4. Step 4: Simplify right side
    1,200x = 929,664
  5. Step 5: Solve for x
    x = 929,664/1,200
  6. Step 6: Final answer
    x = 774.72

Related Problems

Find fourth proportional to 600, 900 and 258.24
Half scale
Find fourth proportional to 2,400, 3,600 and 1,032.96
Double scale
Find fourth proportional to 1,201, 1,801.50 and 517.48
Similar ratio
Find fourth proportional to 1,800, 2,700 and 774.72
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.