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Finding the Fourth Proportional to 1,318,893.20, 1,978,995.90 and 520,200.80

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Solution

The fourth proportional to 1,318,893.20, 1,978,995.90 and 520,200.80 is: 780,559.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,893.20 : 1,978,995.90 = 520,200.80 : x
  2. Step 2: Convert to fraction form
    1,318,893.20/1,978,995.90 = 520,200.80/x
  3. Step 3: Cross multiply
    1,318,893.20x = 1,978,995.90 × 520,200.80
  4. Step 4: Simplify right side
    1,318,893.20x = 1,029,475,250,376.72
  5. Step 5: Solve for x
    x = 1,029,475,250,376.72/1,318,893.20
  6. Step 6: Final answer
    x = 780,559.98

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.