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Finding the Fourth Proportional to 4,987.72, 7,471.99 and 2,789.79

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Solution

The fourth proportional to 4,987.72, 7,471.99 and 2,789.79 is: 4,179.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    4,987.72 : 7,471.99 = 2,789.79 : x
  2. Step 2: Convert to fraction form
    4,987.72/7,471.99 = 2,789.79/x
  3. Step 3: Cross multiply
    4,987.72x = 7,471.99 × 2,789.79
  4. Step 4: Simplify right side
    4,987.72x = 20,845,282.98
  5. Step 5: Solve for x
    x = 20,845,282.98/4,987.72
  6. Step 6: Final answer
    x = 4,179.32

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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.