Home / 274.75-428.38

Finding the Third Proportional to 274.75 and 428.38

Calculator

Solution

The third proportional to 274.75 and 428.38 is: 667.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    274.75 : 428.38 = 428.38 : x
  2. Step 2: Convert to fraction form
    274.75/428.38 = 428.38/x
  3. Step 3: Cross multiply
    274.75x = 428.38 × 428.38
  4. Step 4: Simplify right side
    274.75x = 183,505.14
  5. Step 5: Solve for x
    x = 183,505.14/274.75
  6. Step 6: Final answer
    x = 667.90

Related Problems

Find third proportional to 137.38 and 214.19
Half scale
Find third proportional to 549.50 and 856.75
Double scale
Find third proportional to 277 and 431
Similar ratio
Find third proportional to 412.13 and 642.56
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.56) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.