Home / 277.80-383.80-212.64

Finding the Fourth Proportional to 277.80, 383.80 and 212.64

Calculator

Solution

The fourth proportional to 277.80, 383.80 and 212.64 is: 293.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.80 : 383.80 = 212.64 : x
  2. Step 2: Convert to fraction form
    277.80/383.80 = 212.64/x
  3. Step 3: Cross multiply
    277.80x = 383.80 × 212.64
  4. Step 4: Simplify right side
    277.80x = 81,611.23
  5. Step 5: Solve for x
    x = 81,611.23/277.80
  6. Step 6: Final answer
    x = 293.78

Related Problems

Find fourth proportional to 138.90, 191.90 and 106.32
Half scale
Find fourth proportional to 555.60, 767.60 and 425.28
Double scale
Find fourth proportional to 278.80, 385.18 and 213.64
Similar ratio
Find fourth proportional to 416.70, 575.70 and 318.96
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.