Home / 726.18-1,089-315.12

Finding the Fourth Proportional to 726.18, 1,089 and 315.12

Calculator

Solution

The fourth proportional to 726.18, 1,089 and 315.12 is: 472.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.18 : 1,089 = 315.12 : x
  2. Step 2: Convert to fraction form
    726.18/1,089 = 315.12/x
  3. Step 3: Cross multiply
    726.18x = 1,089 × 315.12
  4. Step 4: Simplify right side
    726.18x = 343,165.68
  5. Step 5: Solve for x
    x = 343,165.68/726.18
  6. Step 6: Final answer
    x = 472.56

Related Problems

Find fourth proportional to 363.09, 544.50 and 157.56
Half scale
Find fourth proportional to 1,452.36, 2,178 and 630.24
Double scale
Find fourth proportional to 727.18, 1,090.50 and 316.12
Similar ratio
Find fourth proportional to 1,089.27, 1,633.50 and 472.68
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.