Home / 228.75-390.75

Finding the Third Proportional to 228.75 and 390.75

Calculator

Solution

The third proportional to 228.75 and 390.75 is: 667.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    228.75 : 390.75 = 390.75 : x
  2. Step 2: Convert to fraction form
    228.75/390.75 = 390.75/x
  3. Step 3: Cross multiply
    228.75x = 390.75 × 390.75
  4. Step 4: Simplify right side
    228.75x = 152,685.56
  5. Step 5: Solve for x
    x = 152,685.56/228.75
  6. Step 6: Final answer
    x = 667.48

Related Problems

Find third proportional to 114.38 and 195.38
Half scale
Find third proportional to 457.50 and 781.50
Double scale
Find third proportional to 231 and 394
Similar ratio
Find third proportional to 343.13 and 586.13
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.71) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.