Home / 1,178.08-1,626-680.80

Finding the Fourth Proportional to 1,178.08, 1,626 and 680.80

Calculator

Solution

The fourth proportional to 1,178.08, 1,626 and 680.80 is: 939.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,178.08 : 1,626 = 680.80 : x
  2. Step 2: Convert to fraction form
    1,178.08/1,626 = 680.80/x
  3. Step 3: Cross multiply
    1,178.08x = 1,626 × 680.80
  4. Step 4: Simplify right side
    1,178.08x = 1,106,980.80
  5. Step 5: Solve for x
    x = 1,106,980.80/1,178.08
  6. Step 6: Final answer
    x = 939.65

Related Problems

Find fourth proportional to 589.04, 813 and 340.40
Half scale
Find fourth proportional to 2,356.16, 3,252 and 1,361.60
Double scale
Find fourth proportional to 1,179.08, 1,627.38 and 681.80
Similar ratio
Find fourth proportional to 1,767.12, 2,439 and 1,021.20
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.