Home / 287.75-439.38

Finding the Third Proportional to 287.75 and 439.38

Calculator

Solution

The third proportional to 287.75 and 439.38 is: 670.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    287.75 : 439.38 = 439.38 : x
  2. Step 2: Convert to fraction form
    287.75/439.38 = 439.38/x
  3. Step 3: Cross multiply
    287.75x = 439.38 × 439.38
  4. Step 4: Simplify right side
    287.75x = 193,050.39
  5. Step 5: Solve for x
    x = 193,050.39/287.75
  6. Step 6: Final answer
    x = 670.90

Related Problems

Find third proportional to 143.88 and 219.69
Half scale
Find third proportional to 575.50 and 878.75
Double scale
Find third proportional to 290 and 442
Similar ratio
Find third proportional to 431.63 and 659.06
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.53) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.