Home / 215.16-399.66

Finding the Third Proportional to 215.16 and 399.66

Calculator

Solution

The third proportional to 215.16 and 399.66 is: 742.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    215.16 : 399.66 = 399.66 : x
  2. Step 2: Convert to fraction form
    215.16/399.66 = 399.66/x
  3. Step 3: Cross multiply
    215.16x = 399.66 × 399.66
  4. Step 4: Simplify right side
    215.16x = 159,725.12
  5. Step 5: Solve for x
    x = 159,725.12/215.16
  6. Step 6: Final answer
    x = 742.37

Related Problems

Find third proportional to 107.58 and 199.83
Half scale
Find third proportional to 430.31 and 799.31
Double scale
Find third proportional to 217 and 403
Similar ratio
Find third proportional to 322.73 and 599.48
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.86) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.