Home / 320-685

Finding the Third Proportional to 320 and 685

Calculator

Solution

The third proportional to 320 and 685 is: 1,466.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    320 : 685 = 685 : x
  2. Step 2: Convert to fraction form
    320/685 = 685/x
  3. Step 3: Cross multiply
    320x = 685 × 685
  4. Step 4: Simplify right side
    320x = 469,225
  5. Step 5: Solve for x
    x = 469,225/320
  6. Step 6: Final answer
    x = 1,466.33

Related Problems

Find third proportional to 160 and 342.50
Half scale
Find third proportional to 640 and 1,370
Double scale
Find third proportional to 322 and 689
Similar ratio
Find third proportional to 480 and 1,027.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.14) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.