Home / 408-505.50

Finding the Third Proportional to 408 and 505.50

Calculator

Solution

The third proportional to 408 and 505.50 is: 626.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    408 : 505.50 = 505.50 : x
  2. Step 2: Convert to fraction form
    408/505.50 = 505.50/x
  3. Step 3: Cross multiply
    408x = 505.50 × 505.50
  4. Step 4: Simplify right side
    408x = 255,530.25
  5. Step 5: Solve for x
    x = 255,530.25/408
  6. Step 6: Final answer
    x = 626.30

Related Problems

Find third proportional to 204 and 252.75
Half scale
Find third proportional to 816 and 1,011
Double scale
Find third proportional to 410 and 508
Similar ratio
Find third proportional to 612 and 758.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.24) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.