Home / 428.15-642.22-103.52

Finding the Fourth Proportional to 428.15, 642.22 and 103.52

Calculator

Solution

The fourth proportional to 428.15, 642.22 and 103.52 is: 155.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    428.15 : 642.22 = 103.52 : x
  2. Step 2: Convert to fraction form
    428.15/642.22 = 103.52/x
  3. Step 3: Cross multiply
    428.15x = 642.22 × 103.52
  4. Step 4: Simplify right side
    428.15x = 66,482.61
  5. Step 5: Solve for x
    x = 66,482.61/428.15
  6. Step 6: Final answer
    x = 155.28

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.