Home / 609.83-915-321.20

Finding the Fourth Proportional to 609.83, 915 and 321.20

Calculator

Solution

The fourth proportional to 609.83, 915 and 321.20 is: 481.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    609.83 : 915 = 321.20 : x
  2. Step 2: Convert to fraction form
    609.83/915 = 321.20/x
  3. Step 3: Cross multiply
    609.83x = 915 × 321.20
  4. Step 4: Simplify right side
    609.83x = 293,893.43
  5. Step 5: Solve for x
    x = 293,893.43/609.83
  6. Step 6: Final answer
    x = 481.93

Related Problems

Find fourth proportional to 304.91, 457.50 and 160.60
Half scale
Find fourth proportional to 1,219.65, 1,830 and 642.39
Double scale
Find fourth proportional to 610.83, 916.50 and 322.20
Similar ratio
Find fourth proportional to 914.74, 1,372.50 and 481.79
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.