Home / 357.30-492.09-331.78

Finding the Fourth Proportional to 357.30, 492.09 and 331.78

Calculator

Solution

The fourth proportional to 357.30, 492.09 and 331.78 is: 456.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    357.30 : 492.09 = 331.78 : x
  2. Step 2: Convert to fraction form
    357.30/492.09 = 331.78/x
  3. Step 3: Cross multiply
    357.30x = 492.09 × 331.78
  4. Step 4: Simplify right side
    357.30x = 163,265.62
  5. Step 5: Solve for x
    x = 163,265.62/357.30
  6. Step 6: Final answer
    x = 456.94

Related Problems

Find fourth proportional to 178.65, 246.05 and 165.89
Half scale
Find fourth proportional to 714.60, 984.18 and 663.56
Double scale
Find fourth proportional to 358.30, 493.47 and 332.78
Similar ratio
Find fourth proportional to 535.95, 738.14 and 497.67
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.