Home / 383-645

Finding the Third Proportional to 383 and 645

Calculator

Solution

The third proportional to 383 and 645 is: 1,086.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    383 : 645 = 645 : x
  2. Step 2: Convert to fraction form
    383/645 = 645/x
  3. Step 3: Cross multiply
    383x = 645 × 645
  4. Step 4: Simplify right side
    383x = 416,025
  5. Step 5: Solve for x
    x = 416,025/383
  6. Step 6: Final answer
    x = 1,086.23

Related Problems

Find third proportional to 191.50 and 322.50
Half scale
Find third proportional to 766 and 1,290
Double scale
Find third proportional to 385 and 648
Similar ratio
Find third proportional to 574.50 and 967.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.68) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.