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Finding the Fourth Proportional to 80,458.80, 120,745.80 and 45,361.20

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Solution

The fourth proportional to 80,458.80, 120,745.80 and 45,361.20 is: 68,074.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,458.80 : 120,745.80 = 45,361.20 : x
  2. Step 2: Convert to fraction form
    80,458.80/120,745.80 = 45,361.20/x
  3. Step 3: Cross multiply
    80,458.80x = 120,745.80 × 45,361.20
  4. Step 4: Simplify right side
    80,458.80x = 5,477,174,382.96
  5. Step 5: Solve for x
    x = 5,477,174,382.96/80,458.80
  6. Step 6: Final answer
    x = 68,074.27

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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.