Home / 540,131.20-809,678.40-420,121.60

Finding the Fourth Proportional to 540,131.20, 809,678.40 and 420,121.60

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Solution

The fourth proportional to 540,131.20, 809,678.40 and 420,121.60 is: 629,779.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    540,131.20 : 809,678.40 = 420,121.60 : x
  2. Step 2: Convert to fraction form
    540,131.20/809,678.40 = 420,121.60/x
  3. Step 3: Cross multiply
    540,131.20x = 809,678.40 × 420,121.60
  4. Step 4: Simplify right side
    540,131.20x = 340,163,384,893.44
  5. Step 5: Solve for x
    x = 340,163,384,893.44/540,131.20
  6. Step 6: Final answer
    x = 629,779.18

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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.