Home / 128.74-274.57

Finding the Third Proportional to 128.74 and 274.57

Calculator

Solution

The third proportional to 128.74 and 274.57 is: 585.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    128.74 : 274.57 = 274.57 : x
  2. Step 2: Convert to fraction form
    128.74/274.57 = 274.57/x
  3. Step 3: Cross multiply
    128.74x = 274.57 × 274.57
  4. Step 4: Simplify right side
    128.74x = 75,388.86
  5. Step 5: Solve for x
    x = 75,388.86/128.74
  6. Step 6: Final answer
    x = 585.58

Related Problems

Find third proportional to 64.37 and 137.29
Half scale
Find third proportional to 257.48 and 549.14
Double scale
Find third proportional to 131 and 279
Similar ratio
Find third proportional to 193.11 and 411.86
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (2.13) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.