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Finding the Fourth Proportional to 4,987.21, 7,471.24 and 2,789.28

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Solution

The fourth proportional to 4,987.21, 7,471.24 and 2,789.28 is: 4,178.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,987.21 : 7,471.24 = 2,789.28 : x
  2. Step 2: Convert to fraction form
    4,987.21/7,471.24 = 2,789.28/x
  3. Step 3: Cross multiply
    4,987.21x = 7,471.24 × 2,789.28
  4. Step 4: Simplify right side
    4,987.21x = 20,839,380.31
  5. Step 5: Solve for x
    x = 20,839,380.31/4,987.21
  6. Step 6: Final answer
    x = 4,178.56

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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.