Home / 408.79-613.56-255

Finding the Fourth Proportional to 408.79, 613.56 and 255

Calculator

Solution

The fourth proportional to 408.79, 613.56 and 255 is: 382.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.79 : 613.56 = 255 : x
  2. Step 2: Convert to fraction form
    408.79/613.56 = 255/x
  3. Step 3: Cross multiply
    408.79x = 613.56 × 255
  4. Step 4: Simplify right side
    408.79x = 156,457.80
  5. Step 5: Solve for x
    x = 156,457.80/408.79
  6. Step 6: Final answer
    x = 382.74

Related Problems

Find fourth proportional to 204.39, 306.78 and 127.50
Half scale
Find fourth proportional to 817.57, 1,227.12 and 510
Double scale
Find fourth proportional to 409.79, 615.06 and 256
Similar ratio
Find fourth proportional to 613.18, 920.34 and 382.50
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.