Home / 613.12-920-325.12

Finding the Fourth Proportional to 613.12, 920 and 325.12

Calculator

Solution

The fourth proportional to 613.12, 920 and 325.12 is: 487.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    613.12 : 920 = 325.12 : x
  2. Step 2: Convert to fraction form
    613.12/920 = 325.12/x
  3. Step 3: Cross multiply
    613.12x = 920 × 325.12
  4. Step 4: Simplify right side
    613.12x = 299,110.40
  5. Step 5: Solve for x
    x = 299,110.40/613.12
  6. Step 6: Final answer
    x = 487.85

Related Problems

Find fourth proportional to 306.56, 460 and 162.56
Half scale
Find fourth proportional to 1,226.24, 1,840 and 650.24
Double scale
Find fourth proportional to 614.12, 921.50 and 326.12
Similar ratio
Find fourth proportional to 919.68, 1,380 and 487.68
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.