Home / 1,143.97-1,578.68-620

Finding the Fourth Proportional to 1,143.97, 1,578.68 and 620

Calculator

Solution

The fourth proportional to 1,143.97, 1,578.68 and 620 is: 855.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.97 : 1,578.68 = 620 : x
  2. Step 2: Convert to fraction form
    1,143.97/1,578.68 = 620/x
  3. Step 3: Cross multiply
    1,143.97x = 1,578.68 × 620
  4. Step 4: Simplify right side
    1,143.97x = 978,781.60
  5. Step 5: Solve for x
    x = 978,781.60/1,143.97
  6. Step 6: Final answer
    x = 855.60

Related Problems

Find fourth proportional to 571.99, 789.34 and 310
Half scale
Find fourth proportional to 2,287.94, 3,157.36 and 1,240
Double scale
Find fourth proportional to 1,144.97, 1,580.06 and 621
Similar ratio
Find fourth proportional to 1,715.96, 2,368.02 and 930
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.