Home / 216.42-309.92

Finding the Third Proportional to 216.42 and 309.92

Calculator

Solution

The third proportional to 216.42 and 309.92 is: 443.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    216.42 : 309.92 = 309.92 : x
  2. Step 2: Convert to fraction form
    216.42/309.92 = 309.92/x
  3. Step 3: Cross multiply
    216.42x = 309.92 × 309.92
  4. Step 4: Simplify right side
    216.42x = 96,050.36
  5. Step 5: Solve for x
    x = 96,050.36/216.42
  6. Step 6: Final answer
    x = 443.81

Related Problems

Find third proportional to 108.21 and 154.96
Half scale
Find third proportional to 432.84 and 619.84
Double scale
Find third proportional to 218 and 313
Similar ratio
Find third proportional to 324.63 and 464.88
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.