Home / 759-815

Finding the Third Proportional to 759 and 815

Calculator

Solution

The third proportional to 759 and 815 is: 875.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    759 : 815 = 815 : x
  2. Step 2: Convert to fraction form
    759/815 = 815/x
  3. Step 3: Cross multiply
    759x = 815 × 815
  4. Step 4: Simplify right side
    759x = 664,225
  5. Step 5: Solve for x
    x = 664,225/759
  6. Step 6: Final answer
    x = 875.13

Related Problems

Find third proportional to 379.50 and 407.50
Half scale
Find third proportional to 1,518 and 1,630
Double scale
Find third proportional to 761 and 817
Similar ratio
Find third proportional to 1,138.50 and 1,222.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.07) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.