Home / 428.40-643.01-233.49

Finding the Fourth Proportional to 428.40, 643.01 and 233.49

Calculator

Solution

The fourth proportional to 428.40, 643.01 and 233.49 is: 350.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.40 : 643.01 = 233.49 : x
  2. Step 2: Convert to fraction form
    428.40/643.01 = 233.49/x
  3. Step 3: Cross multiply
    428.40x = 643.01 × 233.49
  4. Step 4: Simplify right side
    428.40x = 150,135.24
  5. Step 5: Solve for x
    x = 150,135.24/428.40
  6. Step 6: Final answer
    x = 350.46

Related Problems

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.