Home / 645.37-890.43-396.67

Finding the Fourth Proportional to 645.37, 890.43 and 396.67

Calculator

Solution

The fourth proportional to 645.37, 890.43 and 396.67 is: 547.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    645.37 : 890.43 = 396.67 : x
  2. Step 2: Convert to fraction form
    645.37/890.43 = 396.67/x
  3. Step 3: Cross multiply
    645.37x = 890.43 × 396.67
  4. Step 4: Simplify right side
    645.37x = 353,206.87
  5. Step 5: Solve for x
    x = 353,206.87/645.37
  6. Step 6: Final answer
    x = 547.29

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.