Home / 1,189.68-1,785-539.76

Finding the Fourth Proportional to 1,189.68, 1,785 and 539.76

Calculator

Solution

The fourth proportional to 1,189.68, 1,785 and 539.76 is: 809.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,189.68 : 1,785 = 539.76 : x
  2. Step 2: Convert to fraction form
    1,189.68/1,785 = 539.76/x
  3. Step 3: Cross multiply
    1,189.68x = 1,785 × 539.76
  4. Step 4: Simplify right side
    1,189.68x = 963,471.60
  5. Step 5: Solve for x
    x = 963,471.60/1,189.68
  6. Step 6: Final answer
    x = 809.86

Related Problems

Find fourth proportional to 594.84, 892.50 and 269.88
Half scale
Find fourth proportional to 2,379.36, 3,570 and 1,079.52
Double scale
Find fourth proportional to 1,190.68, 1,786.50 and 540.76
Similar ratio
Find fourth proportional to 1,784.52, 2,677.50 and 809.64
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.