Home / 533.40-799.78-208.38

Finding the Fourth Proportional to 533.40, 799.78 and 208.38

Calculator

Solution

The fourth proportional to 533.40, 799.78 and 208.38 is: 312.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    533.40 : 799.78 = 208.38 : x
  2. Step 2: Convert to fraction form
    533.40/799.78 = 208.38/x
  3. Step 3: Cross multiply
    533.40x = 799.78 × 208.38
  4. Step 4: Simplify right side
    533.40x = 166,658.16
  5. Step 5: Solve for x
    x = 166,658.16/533.40
  6. Step 6: Final answer
    x = 312.44

Related Problems

Find fourth proportional to 266.70, 399.89 and 104.19
Half scale
Find fourth proportional to 1,066.80, 1,599.56 and 416.76
Double scale
Find fourth proportional to 534.40, 801.28 and 209.38
Similar ratio
Find fourth proportional to 800.10, 1,199.67 and 312.57
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.