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Finding the Fourth Proportional to 1,318,809.40, 1,978,192.62 and 420,239.02

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Solution

The fourth proportional to 1,318,809.40, 1,978,192.62 and 420,239.02 is: 630,351.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,809.40 : 1,978,192.62 = 420,239.02 : x
  2. Step 2: Convert to fraction form
    1,318,809.40/1,978,192.62 = 420,239.02/x
  3. Step 3: Cross multiply
    1,318,809.40x = 1,978,192.62 × 420,239.02
  4. Step 4: Simplify right side
    1,318,809.40x = 831,313,728,000.03
  5. Step 5: Solve for x
    x = 831,313,728,000.03/1,318,809.40
  6. Step 6: Final answer
    x = 630,351.69

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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.