Home / 256,693-399,040

Finding the Third Proportional to 256,693 and 399,040

Calculator

Solution

The third proportional to 256,693 and 399,040 is: 620,324.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,693 : 399,040 = 399,040 : x
  2. Step 2: Convert to fraction form
    256,693/399,040 = 399,040/x
  3. Step 3: Cross multiply
    256,693x = 399,040 × 399,040
  4. Step 4: Simplify right side
    256,693x = 159,232,921,600
  5. Step 5: Solve for x
    x = 159,232,921,600/256,693
  6. Step 6: Final answer
    x = 620,324.36

Related Problems

Find third proportional to 128,346.50 and 199,520
Half scale
Find third proportional to 513,386 and 798,080
Double scale
Find third proportional to 256,695 and 399,043
Similar ratio
Find third proportional to 385,039.50 and 598,560
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.55) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.