Home / 222.31-331.57-215.65

Finding the Fourth Proportional to 222.31, 331.57 and 215.65

Calculator

Solution

The fourth proportional to 222.31, 331.57 and 215.65 is: 321.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    222.31 : 331.57 = 215.65 : x
  2. Step 2: Convert to fraction form
    222.31/331.57 = 215.65/x
  3. Step 3: Cross multiply
    222.31x = 331.57 × 215.65
  4. Step 4: Simplify right side
    222.31x = 71,503.07
  5. Step 5: Solve for x
    x = 71,503.07/222.31
  6. Step 6: Final answer
    x = 321.64

Related Problems

Find fourth proportional to 111.16, 165.79 and 107.83
Half scale
Find fourth proportional to 444.62, 663.14 and 431.30
Double scale
Find fourth proportional to 223.31, 333.06 and 216.65
Similar ratio
Find fourth proportional to 333.47, 497.36 and 323.48
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.