Home / 139.63-305.25

Finding the Third Proportional to 139.63 and 305.25

Calculator

Solution

The third proportional to 139.63 and 305.25 is: 667.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    139.63 : 305.25 = 305.25 : x
  2. Step 2: Convert to fraction form
    139.63/305.25 = 305.25/x
  3. Step 3: Cross multiply
    139.63x = 305.25 × 305.25
  4. Step 4: Simplify right side
    139.63x = 93,177.56
  5. Step 5: Solve for x
    x = 93,177.56/139.63
  6. Step 6: Final answer
    x = 667.34

Related Problems

Find third proportional to 69.81 and 152.63
Half scale
Find third proportional to 279.25 and 610.50
Double scale
Find third proportional to 142 and 310
Similar ratio
Find third proportional to 209.44 and 457.88
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.