Home / 198.50-318.75

Finding the Third Proportional to 198.50 and 318.75

Calculator

Solution

The third proportional to 198.50 and 318.75 is: 511.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    198.50 : 318.75 = 318.75 : x
  2. Step 2: Convert to fraction form
    198.50/318.75 = 318.75/x
  3. Step 3: Cross multiply
    198.50x = 318.75 × 318.75
  4. Step 4: Simplify right side
    198.50x = 101,601.56
  5. Step 5: Solve for x
    x = 101,601.56/198.50
  6. Step 6: Final answer
    x = 511.85

Related Problems

Find third proportional to 99.25 and 159.38
Half scale
Find third proportional to 397 and 637.50
Double scale
Find third proportional to 201 and 322
Similar ratio
Find third proportional to 297.75 and 478.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.61) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.