Home / 423,290-639,255

Finding the Third Proportional to 423,290 and 639,255

Calculator

Solution

The third proportional to 423,290 and 639,255 is: 965,406.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,290 : 639,255 = 639,255 : x
  2. Step 2: Convert to fraction form
    423,290/639,255 = 639,255/x
  3. Step 3: Cross multiply
    423,290x = 639,255 × 639,255
  4. Step 4: Simplify right side
    423,290x = 408,646,955,025
  5. Step 5: Solve for x
    x = 408,646,955,025/423,290
  6. Step 6: Final answer
    x = 965,406.59

Related Problems

Find third proportional to 211,645 and 319,627.50
Half scale
Find third proportional to 846,580 and 1,278,510
Double scale
Find third proportional to 423,292 and 639,258
Similar ratio
Find third proportional to 634,935 and 958,882.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.