Home / 628.76-942.12-384.78

Finding the Fourth Proportional to 628.76, 942.12 and 384.78

Calculator

Solution

The fourth proportional to 628.76, 942.12 and 384.78 is: 576.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    628.76 : 942.12 = 384.78 : x
  2. Step 2: Convert to fraction form
    628.76/942.12 = 384.78/x
  3. Step 3: Cross multiply
    628.76x = 942.12 × 384.78
  4. Step 4: Simplify right side
    628.76x = 362,503.98
  5. Step 5: Solve for x
    x = 362,503.98/628.76
  6. Step 6: Final answer
    x = 576.54

Related Problems

Find fourth proportional to 314.38, 471.06 and 192.39
Half scale
Find fourth proportional to 1,257.53, 1,884.24 and 769.55
Double scale
Find fourth proportional to 629.76, 943.62 and 385.78
Similar ratio
Find fourth proportional to 943.14, 1,413.18 and 577.16
1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.