Home / 377.21-520.55-219.87

Finding the Fourth Proportional to 377.21, 520.55 and 219.87

Calculator

Solution

The fourth proportional to 377.21, 520.55 and 219.87 is: 303.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    377.21 : 520.55 = 219.87 : x
  2. Step 2: Convert to fraction form
    377.21/520.55 = 219.87/x
  3. Step 3: Cross multiply
    377.21x = 520.55 × 219.87
  4. Step 4: Simplify right side
    377.21x = 114,453.33
  5. Step 5: Solve for x
    x = 114,453.33/377.21
  6. Step 6: Final answer
    x = 303.42

Related Problems

Find fourth proportional to 188.61, 260.28 and 109.94
Half scale
Find fourth proportional to 754.42, 1,041.10 and 439.74
Double scale
Find fourth proportional to 378.21, 521.93 and 220.87
Similar ratio
Find fourth proportional to 565.82, 780.83 and 329.81
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.