Home / 331.20-456.48-312

Finding the Fourth Proportional to 331.20, 456.48 and 312

Calculator

Solution

The fourth proportional to 331.20, 456.48 and 312 is: 430.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.20 : 456.48 = 312 : x
  2. Step 2: Convert to fraction form
    331.20/456.48 = 312/x
  3. Step 3: Cross multiply
    331.20x = 456.48 × 312
  4. Step 4: Simplify right side
    331.20x = 142,421.76
  5. Step 5: Solve for x
    x = 142,421.76/331.20
  6. Step 6: Final answer
    x = 430.02

Related Problems

Find fourth proportional to 165.60, 228.24 and 156
Half scale
Find fourth proportional to 662.40, 912.96 and 624
Double scale
Find fourth proportional to 332.20, 457.86 and 313
Similar ratio
Find fourth proportional to 496.80, 684.72 and 468
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.