Home / 78,528-121,320

Finding the Third Proportional to 78,528 and 121,320

Calculator

Solution

The third proportional to 78,528 and 121,320 is: 187,430.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,528 : 121,320 = 121,320 : x
  2. Step 2: Convert to fraction form
    78,528/121,320 = 121,320/x
  3. Step 3: Cross multiply
    78,528x = 121,320 × 121,320
  4. Step 4: Simplify right side
    78,528x = 14,718,542,400
  5. Step 5: Solve for x
    x = 14,718,542,400/78,528
  6. Step 6: Final answer
    x = 187,430.50

Related Problems

Find third proportional to 39,264 and 60,660
Half scale
Find third proportional to 157,056 and 242,640
Double scale
Find third proportional to 78,530 and 121,323
Similar ratio
Find third proportional to 117,792 and 181,980
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.