Home / 357.11-492.79-217.20

Finding the Fourth Proportional to 357.11, 492.79 and 217.20

Calculator

Solution

The fourth proportional to 357.11, 492.79 and 217.20 is: 299.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.11 : 492.79 = 217.20 : x
  2. Step 2: Convert to fraction form
    357.11/492.79 = 217.20/x
  3. Step 3: Cross multiply
    357.11x = 492.79 × 217.20
  4. Step 4: Simplify right side
    357.11x = 107,033.99
  5. Step 5: Solve for x
    x = 107,033.99/357.11
  6. Step 6: Final answer
    x = 299.72

Related Problems

Find fourth proportional to 178.56, 246.40 and 108.60
Half scale
Find fourth proportional to 714.22, 985.58 and 434.40
Double scale
Find fourth proportional to 358.11, 494.17 and 218.20
Similar ratio
Find fourth proportional to 535.67, 739.19 and 325.80
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.