Home / 426.66-643.78

Finding the Third Proportional to 426.66 and 643.78

Calculator

Solution

The third proportional to 426.66 and 643.78 is: 971.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    426.66 : 643.78 = 643.78 : x
  2. Step 2: Convert to fraction form
    426.66/643.78 = 643.78/x
  3. Step 3: Cross multiply
    426.66x = 643.78 × 643.78
  4. Step 4: Simplify right side
    426.66x = 414,454.30
  5. Step 5: Solve for x
    x = 414,454.30/426.66
  6. Step 6: Final answer
    x = 971.40

Related Problems

Find third proportional to 213.33 and 321.89
Half scale
Find third proportional to 853.31 and 1,287.56
Double scale
Find third proportional to 429 and 647
Similar ratio
Find third proportional to 639.98 and 965.67
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.