Home / 256.11-395.51

Finding the Third Proportional to 256.11 and 395.51

Calculator

Solution

The third proportional to 256.11 and 395.51 is: 610.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    256.11 : 395.51 = 395.51 : x
  2. Step 2: Convert to fraction form
    256.11/395.51 = 395.51/x
  3. Step 3: Cross multiply
    256.11x = 395.51 × 395.51
  4. Step 4: Simplify right side
    256.11x = 156,430.34
  5. Step 5: Solve for x
    x = 156,430.34/256.11
  6. Step 6: Final answer
    x = 610.79

Related Problems

Find third proportional to 128.06 and 197.76
Half scale
Find third proportional to 512.22 and 791.03
Double scale
Find third proportional to 258 and 399
Similar ratio
Find third proportional to 384.17 and 593.27
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.54) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.