Home / 1,991.52-2,988-1,170

Finding the Fourth Proportional to 1,991.52, 2,988 and 1,170

Calculator

Solution

The fourth proportional to 1,991.52, 2,988 and 1,170 is: 1,755.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,991.52 : 2,988 = 1,170 : x
  2. Step 2: Convert to fraction form
    1,991.52/2,988 = 1,170/x
  3. Step 3: Cross multiply
    1,991.52x = 2,988 × 1,170
  4. Step 4: Simplify right side
    1,991.52x = 3,495,960
  5. Step 5: Solve for x
    x = 3,495,960/1,991.52
  6. Step 6: Final answer
    x = 1,755.42

Related Problems

Find fourth proportional to 995.76, 1,494 and 585
Half scale
Find fourth proportional to 3,983.04, 5,976 and 2,340
Double scale
Find fourth proportional to 1,992.52, 2,989.50 and 1,171
Similar ratio
Find fourth proportional to 2,987.28, 4,482 and 1,755
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.