Home / 440.80-661.20-278.26

Finding the Fourth Proportional to 440.80, 661.20 and 278.26

Calculator

Solution

The fourth proportional to 440.80, 661.20 and 278.26 is: 417.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    440.80 : 661.20 = 278.26 : x
  2. Step 2: Convert to fraction form
    440.80/661.20 = 278.26/x
  3. Step 3: Cross multiply
    440.80x = 661.20 × 278.26
  4. Step 4: Simplify right side
    440.80x = 183,985.51
  5. Step 5: Solve for x
    x = 183,985.51/440.80
  6. Step 6: Final answer
    x = 417.39

Related Problems

Find fourth proportional to 220.40, 330.60 and 139.13
Half scale
Find fourth proportional to 881.60, 1,322.40 and 556.52
Double scale
Find fourth proportional to 441.80, 662.70 and 279.26
Similar ratio
Find fourth proportional to 661.20, 991.80 and 417.39
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.