Home / 316.80-475.20-208.57

Finding the Fourth Proportional to 316.80, 475.20 and 208.57

Calculator

Solution

The fourth proportional to 316.80, 475.20 and 208.57 is: 312.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    316.80 : 475.20 = 208.57 : x
  2. Step 2: Convert to fraction form
    316.80/475.20 = 208.57/x
  3. Step 3: Cross multiply
    316.80x = 475.20 × 208.57
  4. Step 4: Simplify right side
    316.80x = 99,112.46
  5. Step 5: Solve for x
    x = 99,112.46/316.80
  6. Step 6: Final answer
    x = 312.86

Related Problems

Find fourth proportional to 158.40, 237.60 and 104.29
Half scale
Find fourth proportional to 633.60, 950.40 and 417.14
Double scale
Find fourth proportional to 317.80, 476.70 and 209.57
Similar ratio
Find fourth proportional to 475.20, 712.80 and 312.86
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.