Home / 308.96-425.64-256.28

Finding the Fourth Proportional to 308.96, 425.64 and 256.28

Calculator

Solution

The fourth proportional to 308.96, 425.64 and 256.28 is: 353.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    308.96 : 425.64 = 256.28 : x
  2. Step 2: Convert to fraction form
    308.96/425.64 = 256.28/x
  3. Step 3: Cross multiply
    308.96x = 425.64 × 256.28
  4. Step 4: Simplify right side
    308.96x = 109,083.02
  5. Step 5: Solve for x
    x = 109,083.02/308.96
  6. Step 6: Final answer
    x = 353.07

Related Problems

Find fourth proportional to 154.48, 212.82 and 128.14
Half scale
Find fourth proportional to 617.92, 851.28 and 512.56
Double scale
Find fourth proportional to 309.96, 427.02 and 257.28
Similar ratio
Find fourth proportional to 463.44, 638.46 and 384.42
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.