Home / 427-639.58-264.48

Finding the Fourth Proportional to 427, 639.58 and 264.48

Calculator

Solution

The fourth proportional to 427, 639.58 and 264.48 is: 396.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    427 : 639.58 = 264.48 : x
  2. Step 2: Convert to fraction form
    427/639.58 = 264.48/x
  3. Step 3: Cross multiply
    427x = 639.58 × 264.48
  4. Step 4: Simplify right side
    427x = 169,156.12
  5. Step 5: Solve for x
    x = 169,156.12/427
  6. Step 6: Final answer
    x = 396.15

Related Problems

Find fourth proportional to 213.50, 319.79 and 132.24
Half scale
Find fourth proportional to 854, 1,279.16 and 528.96
Double scale
Find fourth proportional to 428, 641.08 and 265.48
Similar ratio
Find fourth proportional to 640.50, 959.37 and 396.72
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.