Home / 215.75-315.75

Finding the Third Proportional to 215.75 and 315.75

Calculator

Solution

The third proportional to 215.75 and 315.75 is: 462.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.75 : 315.75 = 315.75 : x
  2. Step 2: Convert to fraction form
    215.75/315.75 = 315.75/x
  3. Step 3: Cross multiply
    215.75x = 315.75 × 315.75
  4. Step 4: Simplify right side
    215.75x = 99,698.06
  5. Step 5: Solve for x
    x = 99,698.06/215.75
  6. Step 6: Final answer
    x = 462.10

Related Problems

Find third proportional to 107.88 and 157.88
Half scale
Find third proportional to 431.50 and 631.50
Double scale
Find third proportional to 218 and 319
Similar ratio
Find third proportional to 323.63 and 473.63
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.46) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.