Home / 68.50-74.75

Finding the Third Proportional to 68.50 and 74.75

Calculator

Solution

The third proportional to 68.50 and 74.75 is: 81.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    68.50 : 74.75 = 74.75 : x
  2. Step 2: Convert to fraction form
    68.50/74.75 = 74.75/x
  3. Step 3: Cross multiply
    68.50x = 74.75 × 74.75
  4. Step 4: Simplify right side
    68.50x = 5,587.56
  5. Step 5: Solve for x
    x = 5,587.56/68.50
  6. Step 6: Final answer
    x = 81.57

Related Problems

Find third proportional to 34.25 and 37.38
Half scale
Find third proportional to 137 and 149.50
Double scale
Find third proportional to 71 and 77
Similar ratio
Find third proportional to 102.75 and 112.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.09) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.