Home / 554-639

Finding the Third Proportional to 554 and 639

Calculator

Solution

The third proportional to 554 and 639 is: 737.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    554 : 639 = 639 : x
  2. Step 2: Convert to fraction form
    554/639 = 639/x
  3. Step 3: Cross multiply
    554x = 639 × 639
  4. Step 4: Simplify right side
    554x = 408,321
  5. Step 5: Solve for x
    x = 408,321/554
  6. Step 6: Final answer
    x = 737.04

Related Problems

Find third proportional to 277 and 319.50
Half scale
Find third proportional to 1,108 and 1,278
Double scale
Find third proportional to 556 and 641
Similar ratio
Find third proportional to 831 and 958.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.