Home / 578.91-868.42-213.61

Finding the Fourth Proportional to 578.91, 868.42 and 213.61

Calculator

Solution

The fourth proportional to 578.91, 868.42 and 213.61 is: 320.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    578.91 : 868.42 = 213.61 : x
  2. Step 2: Convert to fraction form
    578.91/868.42 = 213.61/x
  3. Step 3: Cross multiply
    578.91x = 868.42 × 213.61
  4. Step 4: Simplify right side
    578.91x = 185,505.36
  5. Step 5: Solve for x
    x = 185,505.36/578.91
  6. Step 6: Final answer
    x = 320.44

Related Problems

Find fourth proportional to 289.45, 434.21 and 106.81
Half scale
Find fourth proportional to 1,157.82, 1,736.84 and 427.22
Double scale
Find fourth proportional to 579.91, 869.92 and 214.61
Similar ratio
Find fourth proportional to 868.36, 1,302.63 and 320.42
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.