Home / 87-208.75

Finding the Third Proportional to 87 and 208.75

Calculator

Solution

The third proportional to 87 and 208.75 is: 500.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    87 : 208.75 = 208.75 : x
  2. Step 2: Convert to fraction form
    87/208.75 = 208.75/x
  3. Step 3: Cross multiply
    87x = 208.75 × 208.75
  4. Step 4: Simplify right side
    87x = 43,576.56
  5. Step 5: Solve for x
    x = 43,576.56/87
  6. Step 6: Final answer
    x = 500.88

Related Problems

Find third proportional to 43.50 and 104.38
Half scale
Find third proportional to 174 and 417.50
Double scale
Find third proportional to 89 and 214
Similar ratio
Find third proportional to 130.50 and 313.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.