Home / 409.02-613.17-213.75

Finding the Fourth Proportional to 409.02, 613.17 and 213.75

Calculator

Solution

The fourth proportional to 409.02, 613.17 and 213.75 is: 320.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    409.02 : 613.17 = 213.75 : x
  2. Step 2: Convert to fraction form
    409.02/613.17 = 213.75/x
  3. Step 3: Cross multiply
    409.02x = 613.17 × 213.75
  4. Step 4: Simplify right side
    409.02x = 131,065.09
  5. Step 5: Solve for x
    x = 131,065.09/409.02
  6. Step 6: Final answer
    x = 320.44

Related Problems

Find fourth proportional to 204.51, 306.59 and 106.88
Half scale
Find fourth proportional to 818.04, 1,226.34 and 427.50
Double scale
Find fourth proportional to 410.02, 614.67 and 214.75
Similar ratio
Find fourth proportional to 613.53, 919.76 and 320.63
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.