Home / 726.79-1,089.78-239.71

Finding the Fourth Proportional to 726.79, 1,089.78 and 239.71

Calculator

Solution

The fourth proportional to 726.79, 1,089.78 and 239.71 is: 359.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    726.79 : 1,089.78 = 239.71 : x
  2. Step 2: Convert to fraction form
    726.79/1,089.78 = 239.71/x
  3. Step 3: Cross multiply
    726.79x = 1,089.78 × 239.71
  4. Step 4: Simplify right side
    726.79x = 261,231.16
  5. Step 5: Solve for x
    x = 261,231.16/726.79
  6. Step 6: Final answer
    x = 359.43

Related Problems

Find fourth proportional to 363.40, 544.89 and 119.86
Half scale
Find fourth proportional to 1,453.58, 2,179.56 and 479.42
Double scale
Find fourth proportional to 727.79, 1,091.28 and 240.71
Similar ratio
Find fourth proportional to 1,090.19, 1,634.67 and 359.57
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.