Home / 408.60-612-306

Finding the Fourth Proportional to 408.60, 612 and 306

Calculator

Solution

The fourth proportional to 408.60, 612 and 306 is: 458.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    408.60 : 612 = 306 : x
  2. Step 2: Convert to fraction form
    408.60/612 = 306/x
  3. Step 3: Cross multiply
    408.60x = 612 × 306
  4. Step 4: Simplify right side
    408.60x = 187,272
  5. Step 5: Solve for x
    x = 187,272/408.60
  6. Step 6: Final answer
    x = 458.33

Related Problems

Find fourth proportional to 204.30, 306 and 153
Half scale
Find fourth proportional to 817.20, 1,224 and 612
Double scale
Find fourth proportional to 409.60, 613.50 and 307
Similar ratio
Find fourth proportional to 612.90, 918 and 459
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.