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Finding the Fourth Proportional to 1,318,791.57, 1,978,165.54 and 420,221.10

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Solution

The fourth proportional to 1,318,791.57, 1,978,165.54 and 420,221.10 is: 630,324.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,318,791.57 : 1,978,165.54 = 420,221.10 : x
  2. Step 2: Convert to fraction form
    1,318,791.57/1,978,165.54 = 420,221.10/x
  3. Step 3: Cross multiply
    1,318,791.57x = 1,978,165.54 × 420,221.10
  4. Step 4: Simplify right side
    1,318,791.57x = 831,266,899,200.89
  5. Step 5: Solve for x
    x = 831,266,899,200.89/1,318,791.57
  6. Step 6: Final answer
    x = 630,324.70

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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.