Home / 969.20-1,336.92-689

Finding the Fourth Proportional to 969.20, 1,336.92 and 689

Calculator

Solution

The fourth proportional to 969.20, 1,336.92 and 689 is: 950.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    969.20 : 1,336.92 = 689 : x
  2. Step 2: Convert to fraction form
    969.20/1,336.92 = 689/x
  3. Step 3: Cross multiply
    969.20x = 1,336.92 × 689
  4. Step 4: Simplify right side
    969.20x = 921,137.88
  5. Step 5: Solve for x
    x = 921,137.88/969.20
  6. Step 6: Final answer
    x = 950.41

Related Problems

Find fourth proportional to 484.60, 668.46 and 344.50
Half scale
Find fourth proportional to 1,938.40, 2,673.84 and 1,378
Double scale
Find fourth proportional to 970.20, 1,338.30 and 690
Similar ratio
Find fourth proportional to 1,453.80, 2,005.38 and 1,033.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.