Home / 376.80-519.20-311.52

Finding the Fourth Proportional to 376.80, 519.20 and 311.52

Calculator

Solution

The fourth proportional to 376.80, 519.20 and 311.52 is: 429.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    376.80 : 519.20 = 311.52 : x
  2. Step 2: Convert to fraction form
    376.80/519.20 = 311.52/x
  3. Step 3: Cross multiply
    376.80x = 519.20 × 311.52
  4. Step 4: Simplify right side
    376.80x = 161,741.18
  5. Step 5: Solve for x
    x = 161,741.18/376.80
  6. Step 6: Final answer
    x = 429.25

Related Problems

Find fourth proportional to 188.40, 259.60 and 155.76
Half scale
Find fourth proportional to 753.60, 1,038.40 and 623.04
Double scale
Find fourth proportional to 377.80, 520.58 and 312.52
Similar ratio
Find fourth proportional to 565.20, 778.80 and 467.28
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.