Home / 1,989-3,178.50

Finding the Third Proportional to 1,989 and 3,178.50

Calculator

Solution

The third proportional to 1,989 and 3,178.50 is: 5,079.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,989 : 3,178.50 = 3,178.50 : x
  2. Step 2: Convert to fraction form
    1,989/3,178.50 = 3,178.50/x
  3. Step 3: Cross multiply
    1,989x = 3,178.50 × 3,178.50
  4. Step 4: Simplify right side
    1,989x = 10,102,862.25
  5. Step 5: Solve for x
    x = 10,102,862.25/1,989
  6. Step 6: Final answer
    x = 5,079.37

Related Problems

Find third proportional to 994.50 and 1,589.25
Half scale
Find third proportional to 3,978 and 6,357
Double scale
Find third proportional to 1,991 and 3,182
Similar ratio
Find third proportional to 2,983.50 and 4,767.75
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.60) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.