Home / 128,985-289,695

Finding the Third Proportional to 128,985 and 289,695

Calculator

Solution

The third proportional to 128,985 and 289,695 is: 650,643.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,985 : 289,695 = 289,695 : x
  2. Step 2: Convert to fraction form
    128,985/289,695 = 289,695/x
  3. Step 3: Cross multiply
    128,985x = 289,695 × 289,695
  4. Step 4: Simplify right side
    128,985x = 83,923,193,025
  5. Step 5: Solve for x
    x = 83,923,193,025/128,985
  6. Step 6: Final answer
    x = 650,643.04

Related Problems

Find third proportional to 64,492.50 and 144,847.50
Half scale
Find third proportional to 257,970 and 579,390
Double scale
Find third proportional to 128,987 and 289,699
Similar ratio
Find third proportional to 193,477.50 and 434,542.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.25) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.