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Finding the Fourth Proportional to 3,986,571.80, 5,978,691.30 and 1,427,490.20

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Solution

The fourth proportional to 3,986,571.80, 5,978,691.30 and 1,427,490.20 is: 2,140,817.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,986,571.80 : 5,978,691.30 = 1,427,490.20 : x
  2. Step 2: Convert to fraction form
    3,986,571.80/5,978,691.30 = 1,427,490.20/x
  3. Step 3: Cross multiply
    3,986,571.80x = 5,978,691.30 × 1,427,490.20
  4. Step 4: Simplify right side
    3,986,571.80x = 8,534,523,239,575.26
  5. Step 5: Solve for x
    x = 8,534,523,239,575.26/3,986,571.80
  6. Step 6: Final answer
    x = 2,140,817.64

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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.