Home / 72.75-79.38

Finding the Third Proportional to 72.75 and 79.38

Calculator

Solution

The third proportional to 72.75 and 79.38 is: 86.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.75 : 79.38 = 79.38 : x
  2. Step 2: Convert to fraction form
    72.75/79.38 = 79.38/x
  3. Step 3: Cross multiply
    72.75x = 79.38 × 79.38
  4. Step 4: Simplify right side
    72.75x = 6,300.39
  5. Step 5: Solve for x
    x = 6,300.39/72.75
  6. Step 6: Final answer
    x = 86.60

Related Problems

Find third proportional to 36.38 and 39.69
Half scale
Find third proportional to 145.50 and 158.75
Double scale
Find third proportional to 75 and 82
Similar ratio
Find third proportional to 109.13 and 119.06
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.