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Finding the Fourth Proportional to 3,818,579.20, 5,727,739.20 and 978,719.20

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Solution

The fourth proportional to 3,818,579.20, 5,727,739.20 and 978,719.20 is: 1,468,045.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,818,579.20 : 5,727,739.20 = 978,719.20 : x
  2. Step 2: Convert to fraction form
    3,818,579.20/5,727,739.20 = 978,719.20/x
  3. Step 3: Cross multiply
    3,818,579.20x = 5,727,739.20 × 978,719.20
  4. Step 4: Simplify right side
    3,818,579.20x = 5,605,848,327,632.64
  5. Step 5: Solve for x
    x = 5,605,848,327,632.64/3,818,579.20
  6. Step 6: Final answer
    x = 1,468,045.58

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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.