Home / 277.80-416.73-85.41

Finding the Fourth Proportional to 277.80, 416.73 and 85.41

Calculator

Solution

The fourth proportional to 277.80, 416.73 and 85.41 is: 128.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    277.80 : 416.73 = 85.41 : x
  2. Step 2: Convert to fraction form
    277.80/416.73 = 85.41/x
  3. Step 3: Cross multiply
    277.80x = 416.73 × 85.41
  4. Step 4: Simplify right side
    277.80x = 35,592.91
  5. Step 5: Solve for x
    x = 35,592.91/277.80
  6. Step 6: Final answer
    x = 128.12

Related Problems

Find fourth proportional to 138.90, 208.37 and 42.71
Half scale
Find fourth proportional to 555.60, 833.46 and 170.82
Double scale
Find fourth proportional to 278.80, 418.23 and 86.41
Similar ratio
Find fourth proportional to 416.70, 625.10 and 128.12
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.