Home / 504.78-696.48-305.64

Finding the Fourth Proportional to 504.78, 696.48 and 305.64

Calculator

Solution

The fourth proportional to 504.78, 696.48 and 305.64 is: 421.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    504.78 : 696.48 = 305.64 : x
  2. Step 2: Convert to fraction form
    504.78/696.48 = 305.64/x
  3. Step 3: Cross multiply
    504.78x = 696.48 × 305.64
  4. Step 4: Simplify right side
    504.78x = 212,872.15
  5. Step 5: Solve for x
    x = 212,872.15/504.78
  6. Step 6: Final answer
    x = 421.71

Related Problems

Find fourth proportional to 252.39, 348.24 and 152.82
Half scale
Find fourth proportional to 1,009.56, 1,392.96 and 611.28
Double scale
Find fourth proportional to 505.78, 697.86 and 306.64
Similar ratio
Find fourth proportional to 757.17, 1,044.72 and 458.46
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.