Home / 128,402-309,332

Finding the Third Proportional to 128,402 and 309,332

Calculator

Solution

The third proportional to 128,402 and 309,332 is: 745,208.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,402 : 309,332 = 309,332 : x
  2. Step 2: Convert to fraction form
    128,402/309,332 = 309,332/x
  3. Step 3: Cross multiply
    128,402x = 309,332 × 309,332
  4. Step 4: Simplify right side
    128,402x = 95,686,286,224
  5. Step 5: Solve for x
    x = 95,686,286,224/128,402
  6. Step 6: Final answer
    x = 745,208.69

Related Problems

Find third proportional to 64,201 and 154,666
Half scale
Find third proportional to 256,804 and 618,664
Double scale
Find third proportional to 128,404 and 309,337
Similar ratio
Find third proportional to 192,603 and 463,998
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.41) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.