Home / 642-963.12-300

Finding the Fourth Proportional to 642, 963.12 and 300

Calculator

Solution

The fourth proportional to 642, 963.12 and 300 is: 450.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    642 : 963.12 = 300 : x
  2. Step 2: Convert to fraction form
    642/963.12 = 300/x
  3. Step 3: Cross multiply
    642x = 963.12 × 300
  4. Step 4: Simplify right side
    642x = 288,936
  5. Step 5: Solve for x
    x = 288,936/642
  6. Step 6: Final answer
    x = 450.06

Related Problems

Find fourth proportional to 321, 481.56 and 150
Half scale
Find fourth proportional to 1,284, 1,926.24 and 600
Double scale
Find fourth proportional to 643, 964.62 and 301
Similar ratio
Find fourth proportional to 963, 1,444.68 and 450
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.