Home / 57.38-78.47

Finding the Third Proportional to 57.38 and 78.47

Calculator

Solution

The third proportional to 57.38 and 78.47 is: 107.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.38 : 78.47 = 78.47 : x
  2. Step 2: Convert to fraction form
    57.38/78.47 = 78.47/x
  3. Step 3: Cross multiply
    57.38x = 78.47 × 78.47
  4. Step 4: Simplify right side
    57.38x = 6,157.34
  5. Step 5: Solve for x
    x = 6,157.34/57.38
  6. Step 6: Final answer
    x = 107.32

Related Problems

Find third proportional to 28.69 and 39.23
Half scale
Find third proportional to 114.75 and 156.94
Double scale
Find third proportional to 59 and 81
Similar ratio
Find third proportional to 86.06 and 117.70
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.