Home / 327.30-491.15-278.70

Finding the Fourth Proportional to 327.30, 491.15 and 278.70

Calculator

Solution

The fourth proportional to 327.30, 491.15 and 278.70 is: 418.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    327.30 : 491.15 = 278.70 : x
  2. Step 2: Convert to fraction form
    327.30/491.15 = 278.70/x
  3. Step 3: Cross multiply
    327.30x = 491.15 × 278.70
  4. Step 4: Simplify right side
    327.30x = 136,883.51
  5. Step 5: Solve for x
    x = 136,883.51/327.30
  6. Step 6: Final answer
    x = 418.22

Related Problems

Find fourth proportional to 163.65, 245.58 and 139.35
Half scale
Find fourth proportional to 654.60, 982.30 and 557.40
Double scale
Find fourth proportional to 328.30, 492.65 and 279.70
Similar ratio
Find fourth proportional to 490.95, 736.73 and 418.05
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.