Home / 1,211.50-1,315

Finding the Third Proportional to 1,211.50 and 1,315

Calculator

Solution

The third proportional to 1,211.50 and 1,315 is: 1,427.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,211.50 : 1,315 = 1,315 : x
  2. Step 2: Convert to fraction form
    1,211.50/1,315 = 1,315/x
  3. Step 3: Cross multiply
    1,211.50x = 1,315 × 1,315
  4. Step 4: Simplify right side
    1,211.50x = 1,729,225
  5. Step 5: Solve for x
    x = 1,729,225/1,211.50
  6. Step 6: Final answer
    x = 1,427.34

Related Problems

Find third proportional to 605.75 and 657.50
Half scale
Find third proportional to 2,423 and 2,630
Double scale
Find third proportional to 1,214 and 1,317
Similar ratio
Find third proportional to 1,817.25 and 1,972.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.