Home / 477-658.21-280.47

Finding the Fourth Proportional to 477, 658.21 and 280.47

Calculator

Solution

The fourth proportional to 477, 658.21 and 280.47 is: 387.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    477 : 658.21 = 280.47 : x
  2. Step 2: Convert to fraction form
    477/658.21 = 280.47/x
  3. Step 3: Cross multiply
    477x = 658.21 × 280.47
  4. Step 4: Simplify right side
    477x = 184,608.16
  5. Step 5: Solve for x
    x = 184,608.16/477
  6. Step 6: Final answer
    x = 387.02

Related Problems

Find fourth proportional to 238.50, 329.11 and 140.24
Half scale
Find fourth proportional to 954, 1,316.42 and 560.94
Double scale
Find fourth proportional to 478, 659.59 and 281.47
Similar ratio
Find fourth proportional to 715.50, 987.32 and 420.71
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.