Home / 265.92-398.80-208.21

Finding the Fourth Proportional to 265.92, 398.80 and 208.21

Calculator

Solution

The fourth proportional to 265.92, 398.80 and 208.21 is: 312.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    265.92 : 398.80 = 208.21 : x
  2. Step 2: Convert to fraction form
    265.92/398.80 = 208.21/x
  3. Step 3: Cross multiply
    265.92x = 398.80 × 208.21
  4. Step 4: Simplify right side
    265.92x = 83,034.15
  5. Step 5: Solve for x
    x = 83,034.15/265.92
  6. Step 6: Final answer
    x = 312.25

Related Problems

Find fourth proportional to 132.96, 199.40 and 104.11
Half scale
Find fourth proportional to 531.84, 797.60 and 416.42
Double scale
Find fourth proportional to 266.92, 400.30 and 209.21
Similar ratio
Find fourth proportional to 398.88, 598.20 and 312.32
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.