Home / 1,991.38-2,987-692.82

Finding the Fourth Proportional to 1,991.38, 2,987 and 692.82

Calculator

Solution

The fourth proportional to 1,991.38, 2,987 and 692.82 is: 1,039.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.38 : 2,987 = 692.82 : x
  2. Step 2: Convert to fraction form
    1,991.38/2,987 = 692.82/x
  3. Step 3: Cross multiply
    1,991.38x = 2,987 × 692.82
  4. Step 4: Simplify right side
    1,991.38x = 2,069,453.34
  5. Step 5: Solve for x
    x = 2,069,453.34/1,991.38
  6. Step 6: Final answer
    x = 1,039.21

Related Problems

Find fourth proportional to 995.69, 1,493.50 and 346.41
Half scale
Find fourth proportional to 3,982.76, 5,974 and 1,385.64
Double scale
Find fourth proportional to 1,992.38, 2,988.50 and 693.82
Similar ratio
Find fourth proportional to 2,987.07, 4,480.50 and 1,039.23
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.