Home / 970.38-1,455.39-321

Finding the Fourth Proportional to 970.38, 1,455.39 and 321

Calculator

Solution

The fourth proportional to 970.38, 1,455.39 and 321 is: 481.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    970.38 : 1,455.39 = 321 : x
  2. Step 2: Convert to fraction form
    970.38/1,455.39 = 321/x
  3. Step 3: Cross multiply
    970.38x = 1,455.39 × 321
  4. Step 4: Simplify right side
    970.38x = 467,180.19
  5. Step 5: Solve for x
    x = 467,180.19/970.38
  6. Step 6: Final answer
    x = 481.44

Related Problems

Find fourth proportional to 485.19, 727.70 and 160.50
Half scale
Find fourth proportional to 1,940.76, 2,910.78 and 642
Double scale
Find fourth proportional to 971.38, 1,456.89 and 322
Similar ratio
Find fourth proportional to 1,455.57, 2,183.09 and 481.50
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.