Home / 436.75-639.75

Finding the Third Proportional to 436.75 and 639.75

Calculator

Solution

The third proportional to 436.75 and 639.75 is: 937.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    436.75 : 639.75 = 639.75 : x
  2. Step 2: Convert to fraction form
    436.75/639.75 = 639.75/x
  3. Step 3: Cross multiply
    436.75x = 639.75 × 639.75
  4. Step 4: Simplify right side
    436.75x = 409,280.06
  5. Step 5: Solve for x
    x = 409,280.06/436.75
  6. Step 6: Final answer
    x = 937.10

Related Problems

Find third proportional to 218.38 and 319.88
Half scale
Find third proportional to 873.50 and 1,279.50
Double scale
Find third proportional to 439 and 643
Similar ratio
Find third proportional to 655.13 and 959.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.