Home / 376.42-518.78-289.30

Finding the Fourth Proportional to 376.42, 518.78 and 289.30

Calculator

Solution

The fourth proportional to 376.42, 518.78 and 289.30 is: 398.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    376.42 : 518.78 = 289.30 : x
  2. Step 2: Convert to fraction form
    376.42/518.78 = 289.30/x
  3. Step 3: Cross multiply
    376.42x = 518.78 × 289.30
  4. Step 4: Simplify right side
    376.42x = 150,083.05
  5. Step 5: Solve for x
    x = 150,083.05/376.42
  6. Step 6: Final answer
    x = 398.71

Related Problems

Find fourth proportional to 188.21, 259.39 and 144.65
Half scale
Find fourth proportional to 752.84, 1,037.56 and 578.60
Double scale
Find fourth proportional to 377.42, 520.16 and 290.30
Similar ratio
Find fourth proportional to 564.63, 778.17 and 433.95
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.