Home / 386.80-533.75-221.02

Finding the Fourth Proportional to 386.80, 533.75 and 221.02

Calculator

Solution

The fourth proportional to 386.80, 533.75 and 221.02 is: 304.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.80 : 533.75 = 221.02 : x
  2. Step 2: Convert to fraction form
    386.80/533.75 = 221.02/x
  3. Step 3: Cross multiply
    386.80x = 533.75 × 221.02
  4. Step 4: Simplify right side
    386.80x = 117,969.43
  5. Step 5: Solve for x
    x = 117,969.43/386.80
  6. Step 6: Final answer
    x = 304.99

Related Problems

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.