Home / 55.50-78.75

Finding the Third Proportional to 55.50 and 78.75

Calculator

Solution

The third proportional to 55.50 and 78.75 is: 111.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.50 : 78.75 = 78.75 : x
  2. Step 2: Convert to fraction form
    55.50/78.75 = 78.75/x
  3. Step 3: Cross multiply
    55.50x = 78.75 × 78.75
  4. Step 4: Simplify right side
    55.50x = 6,201.56
  5. Step 5: Solve for x
    x = 6,201.56/55.50
  6. Step 6: Final answer
    x = 111.74

Related Problems

Find third proportional to 27.75 and 39.38
Half scale
Find third proportional to 111 and 157.50
Double scale
Find third proportional to 58 and 82
Similar ratio
Find third proportional to 83.25 and 118.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.42) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.