Home / 66,240-139,320

Finding the Third Proportional to 66,240 and 139,320

Calculator

Solution

The third proportional to 66,240 and 139,320 is: 293,026.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    66,240 : 139,320 = 139,320 : x
  2. Step 2: Convert to fraction form
    66,240/139,320 = 139,320/x
  3. Step 3: Cross multiply
    66,240x = 139,320 × 139,320
  4. Step 4: Simplify right side
    66,240x = 19,410,062,400
  5. Step 5: Solve for x
    x = 19,410,062,400/66,240
  6. Step 6: Final answer
    x = 293,026.30

Related Problems

Find third proportional to 33,120 and 69,660
Half scale
Find third proportional to 132,480 and 278,640
Double scale
Find third proportional to 66,242 and 139,324
Similar ratio
Find third proportional to 99,360 and 208,980
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.10) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.