Home / 1,290-1,635

Finding the Third Proportional to 1,290 and 1,635

Calculator

Solution

The third proportional to 1,290 and 1,635 is: 2,072.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,290 : 1,635 = 1,635 : x
  2. Step 2: Convert to fraction form
    1,290/1,635 = 1,635/x
  3. Step 3: Cross multiply
    1,290x = 1,635 × 1,635
  4. Step 4: Simplify right side
    1,290x = 2,673,225
  5. Step 5: Solve for x
    x = 2,673,225/1,290
  6. Step 6: Final answer
    x = 2,072.27

Related Problems

Find third proportional to 645 and 817.50
Half scale
Find third proportional to 2,580 and 3,270
Double scale
Find third proportional to 1,292 and 1,638
Similar ratio
Find third proportional to 1,935 and 2,452.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.