Home / 1,112-1,668-342.56

Finding the Fourth Proportional to 1,112, 1,668 and 342.56

Calculator

Solution

The fourth proportional to 1,112, 1,668 and 342.56 is: 513.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,112 : 1,668 = 342.56 : x
  2. Step 2: Convert to fraction form
    1,112/1,668 = 342.56/x
  3. Step 3: Cross multiply
    1,112x = 1,668 × 342.56
  4. Step 4: Simplify right side
    1,112x = 571,390.08
  5. Step 5: Solve for x
    x = 571,390.08/1,112
  6. Step 6: Final answer
    x = 513.84

Related Problems

Find fourth proportional to 556, 834 and 171.28
Half scale
Find fourth proportional to 2,224, 3,336 and 685.12
Double scale
Find fourth proportional to 1,113, 1,669.50 and 343.56
Similar ratio
Find fourth proportional to 1,668, 2,502 and 513.84
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.