Home / 273.79-378.20-218.91

Finding the Fourth Proportional to 273.79, 378.20 and 218.91

Calculator

Solution

The fourth proportional to 273.79, 378.20 and 218.91 is: 302.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    273.79 : 378.20 = 218.91 : x
  2. Step 2: Convert to fraction form
    273.79/378.20 = 218.91/x
  3. Step 3: Cross multiply
    273.79x = 378.20 × 218.91
  4. Step 4: Simplify right side
    273.79x = 82,791.76
  5. Step 5: Solve for x
    x = 82,791.76/273.79
  6. Step 6: Final answer
    x = 302.39

Related Problems

Find fourth proportional to 136.90, 189.10 and 109.46
Half scale
Find fourth proportional to 547.58, 756.40 and 437.82
Double scale
Find fourth proportional to 274.79, 379.58 and 219.91
Similar ratio
Find fourth proportional to 410.69, 567.30 and 328.37
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.