Home / 396-780.75

Finding the Third Proportional to 396 and 780.75

Calculator

Solution

The third proportional to 396 and 780.75 is: 1,539.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    396 : 780.75 = 780.75 : x
  2. Step 2: Convert to fraction form
    396/780.75 = 780.75/x
  3. Step 3: Cross multiply
    396x = 780.75 × 780.75
  4. Step 4: Simplify right side
    396x = 609,570.56
  5. Step 5: Solve for x
    x = 609,570.56/396
  6. Step 6: Final answer
    x = 1,539.32

Related Problems

Find third proportional to 198 and 390.38
Half scale
Find third proportional to 792 and 1,561.50
Double scale
Find third proportional to 398 and 785
Similar ratio
Find third proportional to 594 and 1,171.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.97) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.