Home / 335-428

Finding the Third Proportional to 335 and 428

Calculator

Solution

The third proportional to 335 and 428 is: 546.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    335 : 428 = 428 : x
  2. Step 2: Convert to fraction form
    335/428 = 428/x
  3. Step 3: Cross multiply
    335x = 428 × 428
  4. Step 4: Simplify right side
    335x = 183,184
  5. Step 5: Solve for x
    x = 183,184/335
  6. Step 6: Final answer
    x = 546.82

Related Problems

Find third proportional to 167.50 and 214
Half scale
Find third proportional to 670 and 856
Double scale
Find third proportional to 337 and 431
Similar ratio
Find third proportional to 502.50 and 642
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.28) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.