Home / 1,821-3,878.50

Finding the Third Proportional to 1,821 and 3,878.50

Calculator

Solution

The third proportional to 1,821 and 3,878.50 is: 8,260.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,821 : 3,878.50 = 3,878.50 : x
  2. Step 2: Convert to fraction form
    1,821/3,878.50 = 3,878.50/x
  3. Step 3: Cross multiply
    1,821x = 3,878.50 × 3,878.50
  4. Step 4: Simplify right side
    1,821x = 15,042,762.25
  5. Step 5: Solve for x
    x = 15,042,762.25/1,821
  6. Step 6: Final answer
    x = 8,260.72

Related Problems

Find third proportional to 910.50 and 1,939.25
Half scale
Find third proportional to 3,642 and 7,757
Double scale
Find third proportional to 1,823 and 3,883
Similar ratio
Find third proportional to 2,731.50 and 5,817.75
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.