Home / 276.80-417.50-258.80

Finding the Fourth Proportional to 276.80, 417.50 and 258.80

Calculator

Solution

The fourth proportional to 276.80, 417.50 and 258.80 is: 390.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    276.80 : 417.50 = 258.80 : x
  2. Step 2: Convert to fraction form
    276.80/417.50 = 258.80/x
  3. Step 3: Cross multiply
    276.80x = 417.50 × 258.80
  4. Step 4: Simplify right side
    276.80x = 108,049
  5. Step 5: Solve for x
    x = 108,049/276.80
  6. Step 6: Final answer
    x = 390.35

Related Problems

Find fourth proportional to 138.40, 208.75 and 129.40
Half scale
Find fourth proportional to 553.60, 835 and 517.60
Double scale
Find fourth proportional to 277.80, 419.01 and 259.80
Similar ratio
Find fourth proportional to 415.20, 626.25 and 388.20
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.