Home / 247.50-318.38

Finding the Third Proportional to 247.50 and 318.38

Calculator

Solution

The third proportional to 247.50 and 318.38 is: 409.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    247.50 : 318.38 = 318.38 : x
  2. Step 2: Convert to fraction form
    247.50/318.38 = 318.38/x
  3. Step 3: Cross multiply
    247.50x = 318.38 × 318.38
  4. Step 4: Simplify right side
    247.50x = 101,362.64
  5. Step 5: Solve for x
    x = 101,362.64/247.50
  6. Step 6: Final answer
    x = 409.55

Related Problems

Find third proportional to 123.75 and 159.19
Half scale
Find third proportional to 495 and 636.75
Double scale
Find third proportional to 250 and 321
Similar ratio
Find third proportional to 371.25 and 477.56
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.29) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.