Home / 78,808-121,128

Finding the Third Proportional to 78,808 and 121,128

Calculator

Solution

The third proportional to 78,808 and 121,128 is: 186,173.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,808 : 121,128 = 121,128 : x
  2. Step 2: Convert to fraction form
    78,808/121,128 = 121,128/x
  3. Step 3: Cross multiply
    78,808x = 121,128 × 121,128
  4. Step 4: Simplify right side
    78,808x = 14,671,992,384
  5. Step 5: Solve for x
    x = 14,671,992,384/78,808
  6. Step 6: Final answer
    x = 186,173.90

Related Problems

Find third proportional to 39,404 and 60,564
Half scale
Find third proportional to 157,616 and 242,256
Double scale
Find third proportional to 78,810 and 121,131
Similar ratio
Find third proportional to 118,212 and 181,692
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.