Home / 360.80-540.88-206.72

Finding the Fourth Proportional to 360.80, 540.88 and 206.72

Calculator

Solution

The fourth proportional to 360.80, 540.88 and 206.72 is: 309.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    360.80 : 540.88 = 206.72 : x
  2. Step 2: Convert to fraction form
    360.80/540.88 = 206.72/x
  3. Step 3: Cross multiply
    360.80x = 540.88 × 206.72
  4. Step 4: Simplify right side
    360.80x = 111,810.71
  5. Step 5: Solve for x
    x = 111,810.71/360.80
  6. Step 6: Final answer
    x = 309.90

Related Problems

Find fourth proportional to 180.40, 270.44 and 103.36
Half scale
Find fourth proportional to 721.60, 1,081.76 and 413.44
Double scale
Find fourth proportional to 361.80, 542.38 and 207.72
Similar ratio
Find fourth proportional to 541.20, 811.32 and 310.08
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.