Home / 445-642

Finding the Third Proportional to 445 and 642

Calculator

Solution

The third proportional to 445 and 642 is: 926.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    445 : 642 = 642 : x
  2. Step 2: Convert to fraction form
    445/642 = 642/x
  3. Step 3: Cross multiply
    445x = 642 × 642
  4. Step 4: Simplify right side
    445x = 412,164
  5. Step 5: Solve for x
    x = 412,164/445
  6. Step 6: Final answer
    x = 926.21

Related Problems

Why These Related Problems?

These problems maintain the same ratio (1.44) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.