Home / 730-1,390

Finding the Third Proportional to 730 and 1,390

Calculator

Solution

The third proportional to 730 and 1,390 is: 2,646.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    730 : 1,390 = 1,390 : x
  2. Step 2: Convert to fraction form
    730/1,390 = 1,390/x
  3. Step 3: Cross multiply
    730x = 1,390 × 1,390
  4. Step 4: Simplify right side
    730x = 1,932,100
  5. Step 5: Solve for x
    x = 1,932,100/730
  6. Step 6: Final answer
    x = 2,646.71

Related Problems

Find third proportional to 365 and 695
Half scale
Find third proportional to 1,460 and 2,780
Double scale
Find third proportional to 732 and 1,394
Similar ratio
Find third proportional to 1,095 and 2,085
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.90) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.