Home / 331.38-457.08-287.64

Finding the Fourth Proportional to 331.38, 457.08 and 287.64

Calculator

Solution

The fourth proportional to 331.38, 457.08 and 287.64 is: 396.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    331.38 : 457.08 = 287.64 : x
  2. Step 2: Convert to fraction form
    331.38/457.08 = 287.64/x
  3. Step 3: Cross multiply
    331.38x = 457.08 × 287.64
  4. Step 4: Simplify right side
    331.38x = 131,474.49
  5. Step 5: Solve for x
    x = 131,474.49/331.38
  6. Step 6: Final answer
    x = 396.75

Related Problems

Find fourth proportional to 165.69, 228.54 and 143.82
Half scale
Find fourth proportional to 662.76, 914.16 and 575.28
Double scale
Find fourth proportional to 332.38, 458.46 and 288.64
Similar ratio
Find fourth proportional to 497.07, 685.62 and 431.46
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.