Home / 66.66-72.42

Finding the Third Proportional to 66.66 and 72.42

Calculator

Solution

The third proportional to 66.66 and 72.42 is: 78.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    66.66 : 72.42 = 72.42 : x
  2. Step 2: Convert to fraction form
    66.66/72.42 = 72.42/x
  3. Step 3: Cross multiply
    66.66x = 72.42 × 72.42
  4. Step 4: Simplify right side
    66.66x = 5,244.93
  5. Step 5: Solve for x
    x = 5,244.93/66.66
  6. Step 6: Final answer
    x = 78.69

Related Problems

Find third proportional to 33.33 and 36.21
Half scale
Find third proportional to 133.31 and 144.84
Double scale
Find third proportional to 69 and 75
Similar ratio
Find third proportional to 99.98 and 108.63
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.