Home / 256,840-340,890

Finding the Third Proportional to 256,840 and 340,890

Calculator

Solution

The third proportional to 256,840 and 340,890 is: 452,445.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,840 : 340,890 = 340,890 : x
  2. Step 2: Convert to fraction form
    256,840/340,890 = 340,890/x
  3. Step 3: Cross multiply
    256,840x = 340,890 × 340,890
  4. Step 4: Simplify right side
    256,840x = 116,205,992,100
  5. Step 5: Solve for x
    x = 116,205,992,100/256,840
  6. Step 6: Final answer
    x = 452,445.07

Related Problems

Find third proportional to 128,420 and 170,445
Half scale
Find third proportional to 513,680 and 681,780
Double scale
Find third proportional to 256,842 and 340,893
Similar ratio
Find third proportional to 385,260 and 511,335
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.33) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.