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Finding the Fourth Proportional to 1,985,893.60, 2,978,840.40 and 1,189,631.20

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Solution

The fourth proportional to 1,985,893.60, 2,978,840.40 and 1,189,631.20 is: 1,784,446.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,985,893.60 : 2,978,840.40 = 1,189,631.20 : x
  2. Step 2: Convert to fraction form
    1,985,893.60/2,978,840.40 = 1,189,631.20/x
  3. Step 3: Cross multiply
    1,985,893.60x = 2,978,840.40 × 1,189,631.20
  4. Step 4: Simplify right side
    1,985,893.60x = 3,543,721,479,660.48
  5. Step 5: Solve for x
    x = 3,543,721,479,660.48/1,985,893.60
  6. Step 6: Final answer
    x = 1,784,446.80

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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.