Home / 128,392-309,286

Finding the Third Proportional to 128,392 and 309,286

Calculator

Solution

The third proportional to 128,392 and 309,286 is: 745,045.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,392 : 309,286 = 309,286 : x
  2. Step 2: Convert to fraction form
    128,392/309,286 = 309,286/x
  3. Step 3: Cross multiply
    128,392x = 309,286 × 309,286
  4. Step 4: Simplify right side
    128,392x = 95,657,829,796
  5. Step 5: Solve for x
    x = 95,657,829,796/128,392
  6. Step 6: Final answer
    x = 745,045.09

Related Problems

Find third proportional to 64,196 and 154,643
Half scale
Find third proportional to 256,784 and 618,572
Double scale
Find third proportional to 128,394 and 309,291
Similar ratio
Find third proportional to 192,588 and 463,929
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.