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Finding the Fourth Proportional to 18,896.72, 28,320.34 and 7,790.48

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Solution

The fourth proportional to 18,896.72, 28,320.34 and 7,790.48 is: 11,675.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,896.72 : 28,320.34 = 7,790.48 : x
  2. Step 2: Convert to fraction form
    18,896.72/28,320.34 = 7,790.48/x
  3. Step 3: Cross multiply
    18,896.72x = 28,320.34 × 7,790.48
  4. Step 4: Simplify right side
    18,896.72x = 220,629,042.36
  5. Step 5: Solve for x
    x = 220,629,042.36/18,896.72
  6. Step 6: Final answer
    x = 11,675.52

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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.