Home / 305-420.34-281.80

Finding the Fourth Proportional to 305, 420.34 and 281.80

Calculator

Solution

The fourth proportional to 305, 420.34 and 281.80 is: 388.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    305 : 420.34 = 281.80 : x
  2. Step 2: Convert to fraction form
    305/420.34 = 281.80/x
  3. Step 3: Cross multiply
    305x = 420.34 × 281.80
  4. Step 4: Simplify right side
    305x = 118,451.81
  5. Step 5: Solve for x
    x = 118,451.81/305
  6. Step 6: Final answer
    x = 388.37

Related Problems

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.