Home / 87,690-128,253

Finding the Third Proportional to 87,690 and 128,253

Calculator

Solution

The third proportional to 87,690 and 128,253 is: 187,579.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,690 : 128,253 = 128,253 : x
  2. Step 2: Convert to fraction form
    87,690/128,253 = 128,253/x
  3. Step 3: Cross multiply
    87,690x = 128,253 × 128,253
  4. Step 4: Simplify right side
    87,690x = 16,448,832,009
  5. Step 5: Solve for x
    x = 16,448,832,009/87,690
  6. Step 6: Final answer
    x = 187,579.34

Related Problems

Find third proportional to 43,845 and 64,126.50
Half scale
Find third proportional to 175,380 and 256,506
Double scale
Find third proportional to 87,692 and 128,256
Similar ratio
Find third proportional to 131,535 and 192,379.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.