Home / 311,121-678,555

Finding the Third Proportional to 311,121 and 678,555

Calculator

Solution

The third proportional to 311,121 and 678,555 is: 1,479,928.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    311,121 : 678,555 = 678,555 : x
  2. Step 2: Convert to fraction form
    311,121/678,555 = 678,555/x
  3. Step 3: Cross multiply
    311,121x = 678,555 × 678,555
  4. Step 4: Simplify right side
    311,121x = 460,436,888,025
  5. Step 5: Solve for x
    x = 460,436,888,025/311,121
  6. Step 6: Final answer
    x = 1,479,928.67

Related Problems

Find third proportional to 155,560.50 and 339,277.50
Half scale
Find third proportional to 622,242 and 1,357,110
Double scale
Find third proportional to 311,123 and 678,559
Similar ratio
Find third proportional to 466,681.50 and 1,017,832.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.18) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.