Home / 74-139

Finding the Third Proportional to 74 and 139

Calculator

Solution

The third proportional to 74 and 139 is: 261.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    74 : 139 = 139 : x
  2. Step 2: Convert to fraction form
    74/139 = 139/x
  3. Step 3: Cross multiply
    74x = 139 × 139
  4. Step 4: Simplify right side
    74x = 19,321
  5. Step 5: Solve for x
    x = 19,321/74
  6. Step 6: Final answer
    x = 261.09

Related Problems

Find third proportional to 37 and 69.50
Half scale
Find third proportional to 148 and 278
Double scale
Find third proportional to 76 and 143
Similar ratio
Find third proportional to 111 and 208.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.88) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.