Home / 766.80-1,150.08-279.60

Finding the Fourth Proportional to 766.80, 1,150.08 and 279.60

Calculator

Solution

The fourth proportional to 766.80, 1,150.08 and 279.60 is: 419.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.80 : 1,150.08 = 279.60 : x
  2. Step 2: Convert to fraction form
    766.80/1,150.08 = 279.60/x
  3. Step 3: Cross multiply
    766.80x = 1,150.08 × 279.60
  4. Step 4: Simplify right side
    766.80x = 321,562.37
  5. Step 5: Solve for x
    x = 321,562.37/766.80
  6. Step 6: Final answer
    x = 419.36

Related Problems

Find fourth proportional to 383.40, 575.04 and 139.80
Half scale
Find fourth proportional to 1,533.60, 2,300.16 and 559.20
Double scale
Find fourth proportional to 767.80, 1,151.58 and 280.60
Similar ratio
Find fourth proportional to 1,150.20, 1,725.12 and 419.40
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.