Home / 81-115.50

Finding the Third Proportional to 81 and 115.50

Calculator

Solution

The third proportional to 81 and 115.50 is: 164.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    81 : 115.50 = 115.50 : x
  2. Step 2: Convert to fraction form
    81/115.50 = 115.50/x
  3. Step 3: Cross multiply
    81x = 115.50 × 115.50
  4. Step 4: Simplify right side
    81x = 13,340.25
  5. Step 5: Solve for x
    x = 13,340.25/81
  6. Step 6: Final answer
    x = 164.69

Related Problems

Find third proportional to 40.50 and 57.75
Half scale
Find third proportional to 162 and 231
Double scale
Find third proportional to 83 and 118
Similar ratio
Find third proportional to 121.50 and 173.25
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.43) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.