Home / 73-87

Finding the Third Proportional to 73 and 87

Calculator

Solution

The third proportional to 73 and 87 is: 103.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    73 : 87 = 87 : x
  2. Step 2: Convert to fraction form
    73/87 = 87/x
  3. Step 3: Cross multiply
    73x = 87 × 87
  4. Step 4: Simplify right side
    73x = 7,569
  5. Step 5: Solve for x
    x = 7,569/73
  6. Step 6: Final answer
    x = 103.68

Related Problems

Find third proportional to 36.50 and 43.50
Half scale
Find third proportional to 146 and 174
Double scale
Find third proportional to 75 and 89
Similar ratio
Find third proportional to 109.50 and 130.50
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.19) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.