Home / 356-491.28-208.64

Finding the Fourth Proportional to 356, 491.28 and 208.64

Calculator

Solution

The fourth proportional to 356, 491.28 and 208.64 is: 287.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    356 : 491.28 = 208.64 : x
  2. Step 2: Convert to fraction form
    356/491.28 = 208.64/x
  3. Step 3: Cross multiply
    356x = 491.28 × 208.64
  4. Step 4: Simplify right side
    356x = 102,500.66
  5. Step 5: Solve for x
    x = 102,500.66/356
  6. Step 6: Final answer
    x = 287.92

Related Problems

Find fourth proportional to 178, 245.64 and 104.32
Half scale
Find fourth proportional to 712, 982.56 and 417.28
Double scale
Find fourth proportional to 357, 492.66 and 209.64
Similar ratio
Find fourth proportional to 534, 736.92 and 312.96
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.