Home / 18.56-39.87

Finding the Third Proportional to 18.56 and 39.87

Calculator

Solution

The third proportional to 18.56 and 39.87 is: 85.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    18.56 : 39.87 = 39.87 : x
  2. Step 2: Convert to fraction form
    18.56/39.87 = 39.87/x
  3. Step 3: Cross multiply
    18.56x = 39.87 × 39.87
  4. Step 4: Simplify right side
    18.56x = 1,589.39
  5. Step 5: Solve for x
    x = 1,589.39/18.56
  6. Step 6: Final answer
    x = 85.62

Related Problems

Find third proportional to 9.28 and 19.93
Half scale
Find third proportional to 37.13 and 79.73
Double scale
Find third proportional to 21 and 44
Similar ratio
Find third proportional to 27.84 and 59.80
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.15) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.