Home / 364-643

Finding the Third Proportional to 364 and 643

Calculator

Solution

The third proportional to 364 and 643 is: 1,135.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    364 : 643 = 643 : x
  2. Step 2: Convert to fraction form
    364/643 = 643/x
  3. Step 3: Cross multiply
    364x = 643 × 643
  4. Step 4: Simplify right side
    364x = 413,449
  5. Step 5: Solve for x
    x = 413,449/364
  6. Step 6: Final answer
    x = 1,135.85

Related Problems

Find third proportional to 182 and 321.50
Half scale
Find third proportional to 728 and 1,286
Double scale
Find third proportional to 366 and 647
Similar ratio
Find third proportional to 546 and 964.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.77) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.