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Finding the Fourth Proportional to 576,139.20, 862,135.20 and 389,515.20

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Solution

The fourth proportional to 576,139.20, 862,135.20 and 389,515.20 is: 582,870.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    576,139.20 : 862,135.20 = 389,515.20 : x
  2. Step 2: Convert to fraction form
    576,139.20/862,135.20 = 389,515.20/x
  3. Step 3: Cross multiply
    576,139.20x = 862,135.20 × 389,515.20
  4. Step 4: Simplify right side
    576,139.20x = 335,814,764,855.04
  5. Step 5: Solve for x
    x = 335,814,764,855.04/576,139.20
  6. Step 6: Final answer
    x = 582,870.88

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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.