Home / 78.61-115.66

Finding the Third Proportional to 78.61 and 115.66

Calculator

Solution

The third proportional to 78.61 and 115.66 is: 170.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    78.61 : 115.66 = 115.66 : x
  2. Step 2: Convert to fraction form
    78.61/115.66 = 115.66/x
  3. Step 3: Cross multiply
    78.61x = 115.66 × 115.66
  4. Step 4: Simplify right side
    78.61x = 13,378.18
  5. Step 5: Solve for x
    x = 13,378.18/78.61
  6. Step 6: Final answer
    x = 170.19

Related Problems

Find third proportional to 39.30 and 57.83
Half scale
Find third proportional to 157.22 and 231.33
Double scale
Find third proportional to 81 and 119
Similar ratio
Find third proportional to 117.91 and 173.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.47) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.