Home / 481.92-664.79-285.40

Finding the Fourth Proportional to 481.92, 664.79 and 285.40

Calculator

Solution

The fourth proportional to 481.92, 664.79 and 285.40 is: 393.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    481.92 : 664.79 = 285.40 : x
  2. Step 2: Convert to fraction form
    481.92/664.79 = 285.40/x
  3. Step 3: Cross multiply
    481.92x = 664.79 × 285.40
  4. Step 4: Simplify right side
    481.92x = 189,731.07
  5. Step 5: Solve for x
    x = 189,731.07/481.92
  6. Step 6: Final answer
    x = 393.70

Related Problems

Find fourth proportional to 240.96, 332.40 and 142.70
Half scale
Find fourth proportional to 963.84, 1,329.58 and 570.80
Double scale
Find fourth proportional to 482.92, 666.17 and 286.40
Similar ratio
Find fourth proportional to 722.88, 997.19 and 428.10
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.