Home / 1,326.08-1,988-812

Finding the Fourth Proportional to 1,326.08, 1,988 and 812

Calculator

Solution

The fourth proportional to 1,326.08, 1,988 and 812 is: 1,217.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.08 : 1,988 = 812 : x
  2. Step 2: Convert to fraction form
    1,326.08/1,988 = 812/x
  3. Step 3: Cross multiply
    1,326.08x = 1,988 × 812
  4. Step 4: Simplify right side
    1,326.08x = 1,614,256
  5. Step 5: Solve for x
    x = 1,614,256/1,326.08
  6. Step 6: Final answer
    x = 1,217.31

Related Problems

Find fourth proportional to 663.04, 994 and 406
Half scale
Find fourth proportional to 2,652.16, 3,976 and 1,624
Double scale
Find fourth proportional to 1,327.08, 1,989.50 and 813
Similar ratio
Find fourth proportional to 1,989.12, 2,982 and 1,218
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.