Home / 235.50-639

Finding the Third Proportional to 235.50 and 639

Calculator

Solution

The third proportional to 235.50 and 639 is: 1,733.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    235.50 : 639 = 639 : x
  2. Step 2: Convert to fraction form
    235.50/639 = 639/x
  3. Step 3: Cross multiply
    235.50x = 639 × 639
  4. Step 4: Simplify right side
    235.50x = 408,321
  5. Step 5: Solve for x
    x = 408,321/235.50
  6. Step 6: Final answer
    x = 1,733.85

Related Problems

Find third proportional to 117.75 and 319.50
Half scale
Find third proportional to 471 and 1,278
Double scale
Find third proportional to 238 and 644
Similar ratio
Find third proportional to 353.25 and 958.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.