Home / 328.78-418.92

Finding the Third Proportional to 328.78 and 418.92

Calculator

Solution

The third proportional to 328.78 and 418.92 is: 533.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    328.78 : 418.92 = 418.92 : x
  2. Step 2: Convert to fraction form
    328.78/418.92 = 418.92/x
  3. Step 3: Cross multiply
    328.78x = 418.92 × 418.92
  4. Step 4: Simplify right side
    328.78x = 175,495.54
  5. Step 5: Solve for x
    x = 175,495.54/328.78
  6. Step 6: Final answer
    x = 533.78

Related Problems

Find third proportional to 164.39 and 209.46
Half scale
Find third proportional to 657.56 and 837.84
Double scale
Find third proportional to 331 and 421
Similar ratio
Find third proportional to 493.17 and 628.38
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.27) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.